If one person in the group has a great Study you all love consider using the references/citations in that study to find other studies mentioned. Remember to stay within the parameters set by your professors for your study: Date last 5 years, Scholarly, Peer Reviewed or Academic Journal, Empirical Study. Make sure to have your Professor validate the study you have choosen.
Use the Full Text: How do I find it LibGuide to find these citations above.
Search for the reverse of your topic. For example if you can not find anything on Nursing Students AND Physical Fitness try Nursing Students (or students in health disciplines) AND Exercis* AND Weight or Obesity.
Don't forget to use your Truncation Symbols.
Don't forget how Boolean Operators work.
Don't forget to keep a running list of synonyms.