You can find subject headings (subjects, places, people) in VIRGO on the left-hand side of the screen. Clicking on one will take you to a list of related materials that share that subject heading, which means they will deal specifically with the topic.
Some possible subject headings might be…
[Language] -- Grammar
[Language] -- Grammar -- Handbooks, Manuals, etc.
Ethnology -- [Geographic Location]
Ethnology -- [Geographic Location] -- [Sublocation]