Be careful not to box yourself into a concrete search term for your topic. Think of synonyms for your subject - broader terms, related terms, and narrower terms. Using this strategy will guarantee a wider selection of materials. Be aware, too, that some search terms may be uncomfortable to think or say out loud - but could yield possible results.
The term Latinx is fairly recent, and is meant to encompass a variety of geographic areas, experiences, cultures, and identities. To help broaden and narrow searches, consider countries (e.g., Cuba) as well as national identities (e.g., Peruvian-American).
Possible search terms: Central America, Spanish speakers, Mexico, Panamanian, Buenos Aires, Chile, Puerto Rican, Latino/a/x, Hispanic