When you are searching for posts, you can use settings to make your searches more precise.
@username searches for all posts from that username
in:[setting] Searches for posts with more precision using settings.
x in:title Searches for posts with x in title
status: searches for posts with a certain status
order: orders posts by a certain order
(This should help your searching.)
You can also go and press the button to the left to bring up this screen:
This can help you filter your searches and makes them more precise.