If you're searching Mastodon, there are special phrases called "operators" that you can include to narrow down your search. For example, if you just want to search your own posts you can include the operator from:me alongside your keywords.
There's a complete guide to searching Mastodon including a list of all the operators at:
️ https://fedi.tips/how-do-i-search-for-stuff-on-mastodon
You can combine several operators in one search to narrow it even further, or include a minus sign - to exclude stuff.