Not getting enough? Expand your search results by looking for alternate word endings (aka truncation), breaking your search concepts down, thinking of alternate search terms (including scientific names if applicable) and connecting them with OR, and using the database's features for finding additional references.
Alternate Word Endings and Spellings (Truncation)
Break Your Topic Into Concepts and Think of Alternate Terms or Synonyms
Use Database Features to Find Additional References
Use Web of Science's uniquely powerful citation features to find additional references.