To be more successful in your search:
Use the ADVANCED search
Use truncation -- place an * (asterisks) at the end of your base word to include variations of that term in your search, i.e. brand* will search on brand, brands, branding, etc.
Use synonyms to broaden your search
Use AND to combine search concepts to retrieve articles about BOTH your nonprofit AND the major marketing concept, i.e. symphony AND brand*
Use NOT to eliminate terms from your search and results
Limited your results by publication date, i.e. 2008 to 2015