The databases you will be using are not like Google. Break your question up into smaller keywords and use the Advanced Search function when possible to combine your keywords in your search.
Use "evidence-based" as one of the keywords to search for articles that have "evidence-based" in the abstract. This will usually indicate that the article is about an evidence-based practice topic.
Brainstorm keywords before you begin searching, and as you search. Your search strategies may change as you get to know the database and the terms and subject headings it uses for specific topics.
PubMed - Use the MESH database to build your search using controlled vocabulary.