The quality of the search terms you put in the Google search box will determine the quality of your results.
There are a LOT of tips and tricks for Googling but first master the basics of doing a proper Google search.
Try these basics:
Type in some simple search terms using only the important keywords
If the initial results aren’t what you want, alter the search terms and get more specific (get clues from the initial search results e.g. you might see synonyms that would work or get ideas from the “People Also Ask” section)
Use quotation marks if you want your keywords in an exact order, e.g. “raining cats and dogs”
Remember:
use your best guess with spelling (Google will often understand)
don’t worry about punctuation
understand that everyone’s results will be different, even if they use the same search terms (depending on browser history, location etc.)
Here is a short video which explains how Google works:
https://www.youtube.com/watch?v=LVV_93mBfSU