If you are not finding relevant resources using keyword searches, try using subject terms, also know as descriptors. These are terms assigned to resources by catalogers using a standardized vocabulary. They are conducive to more precise searching. You will often find subject terms or descriptors in a resource's full record. Some databases also have a thesaurus where you can look up subject terms.
Below is a search for the term "texting" in the EBSCO MegaFILE thesaurus (called Subjects).
Click on a subject term such as "TEXT messages (Telephone systems)" to see a definition of the term and options for broader and narrower terms.
Using subject terms will often help you find results relevant to your research topic.
This video illustrates using a thesaurus in a subject-specific database.
LION TV: Library Information Literacy Online Network