Here are some basic search tips that work on virtually every database.
When searching Google Scholar it is important to use if effectively.
The appendix from the book Googlepedia® by Michael Miller, 3rd ed, 2008
has some excellent tips.
Here are some basic search tips to target better articles:
If yes, look for clues to help continue your search:
If no, did you find too many results? Too few?
Doesn’t exist is a hard concept to grasp in this age of technology! It might also mean that it is not available in the places/resources you are searching (Proprietary, not well funded research topic, positive publication bias, etc.)
This handout includes strategies including checking references, checking point of care tools, cited reference searching, and PubMed's similar articles feature.
The PubMed for Nurses Online Training is a 30 minute self guided tutorial that is targeted toward nurses but is helpful for anyone who would like to learn about literature searching in Pubmed. This tutorial includes modules on simple searching, using filters, using PubMed Clinical Queries, and My NCBI.