Try using "*" to find documents that match any book that has part of the term entered. For example, "math*" will also match "mathematics".
Fuzzy MatchesUse "~" and a number to use fuzzy matching, finding books close to the term provided. A higher number will increase the number of results. For example, "math~1" would also match "bath", but not "mathematics".
Term PresenceBy default, multiple search terms will be combined with OR. You can control this with "+" and "-" to specifically include or exclude terms. For example: "math +exam -manual".