Many databases offer you the choice of an Advanced Search option. It is worth looking at this as the options can help you narrow your results in useful ways. For example, you may only want articles from journals, and not from magazines and newspapers, or this may be a better way of eliminating reviews from your search, instead of using NOT.
Even Google offers an Advanced Search, accessed from the icon on the far right of the screen: ↓
Google’s Advanced search:
Finally let's turn our attention to considering not what to search for, but where to search.