We want improvements to search:

CTRL+F SHORTCUT
I wanto to find messages inside a chat or channel with CTRL+F.
It’ll allow me to quick search messages in a specific conversation.

PARITY TO SKYPE SEARCH
Like in Skype chat, we need to be able to search text strings from conversations

IMPROVE SEARCH RESULTS VIEW
I feel as though the conversation view looks a bit cluttered as is, and conversation threads are not as readily identifiable as I had hoped they would be. Some suggestions are: Add the ability to include a Topic Header for a conversation so that you can easily ID a conversation you are interested in, perhaps alternate the colour theme between conversation threads (i.e. first conversation has a purple background, the next one has a red background, then green, etc.) to very quickly distinguish between threads.

SEARCH WIKI and OneNOTE
Make the search bar also search through content in Wiki and OneNote.

PARTIAL WORD SEARCH
Currently when you perform a search you will only find the exact word you type, but I think it should do at least partial word search, e.g., find the word “categorize” in the word “categorized”.

IMPROVE SEARCH RESULTS
http://www.marksgroup.net/blog/microsoft-teams-global-search-filtering/

Aside from search functions for “Channel”, could we have a better search function for “Chats” too?

The problem is detailed above (the first two comments in the comments section) – usually,
Teams directs us to the words only (for Chats) but what we really needed was the full context, the surrounding conversation on that day. See attachment, where I was looking to be directed to 25 Jan conversation but search only turns up a specific section. How this would have worked better is if users could have clicked on that conversation to jump straight to conversations on 25 Jan.
Also – the search function cannot be filtered by Channels. For example, if you were searching “WIP“, everything regarding “WIP“ on Chats and across channels turns up, even though you’re only looking for it on a specific channel. Filtering does not help as it requires you to type a subject and then it doesn’t turn up what you require. Some improvements in this area would be really great!

Searching for something works (mostly), however if the thing you're search for is sufficiently far back in time, then it's nigh impossible to actually get results back. Clicking the message says "go to chat to see the rest", but clicking on that does nothing but take you back to the chat at the current time, rather than the target message. If you bookmark the message and try to get at the location in chat via that, then the client just lags and eventually crashes. (while chewing up 100% CPU) Tried the desktop client (developer preview), web client Chrome, web client Edge, all won't work for really big chats. It seems like it's trying to load the entirety of the chat conversation between now and the point in time that the message happened and then also trying to render and scroll up for that. This is crazy inefficient. It should load a few screens before that chat message, a few after, and then redraw. (so that total effort is nearly 0 rather than "10,000 lines of chats")

We are not able to use a partial string when searching in conversations or for names of files shared in conversations. Example: file name is "Collaboration Productivity Overview." I can use one of these words and find the file, but I cannot use part of a word such as "collab" or "Prod" and locate the file. It finds onlt references that used these exact characters. This becomes a problem when we are looking for reference to a client, whose name is spelled in several different ways by different users. If we could enter just the first few letters, or use a wildcard, it would allow us to find the information. If we have to guess how it was spelled in the conversation, or in the file name, then we will miss references to the client.

I have a few hundred teams. When I use the search under Teams to find the Team I want, and click it, it does show the correct team on the right, but suppose I didn't want the General channel, suppose I wanted another channel, now I must click the team name at the top ("Team_Name > General"), then click "Channels" and click the channel I wanted.

This is because in my list of a few hundred teams, I cannot be bothered to scroll through the long list of team names on the left navigation tree.

It would be better if, after clicking the team name from the search results, the left navigation tree automatically advanced to the team and expanded it for me, so I can see the channels from the left navigation tree, instead of having 4 additional clicks to get to the channel I want.