The next stage is to have a look at your results. Are you seeing the kind of articles you expected? If you come across alternative search terms that you had not thought of, you can go back and add these to your search.
If your results are broadly what you were looking for, but you want to tidy up your search, some databases have the option to add some limits to your search on the results screen. These are often in a bar on the left hand side of the screen. You can limit by year, type of publication, language, and other factors depending on your database. You often have the option to either include or exclude what you have selected: you cannot normally include and exclude in a single step.
In Scopus it looks like this:
If you have a large number of results and not many of them look relevant to your topic, you need to make your search more specific. Here are some tips for this:
If you are getting very few results, or none at all, you need to try making your search broader. Here are some tips for this:
If you are looking for an obscure or very recent topic, it may be that there are only very few (or no) results on that topic. Make an appointment to chat with a Reference Librarian if you are unsure.