Searching Spanish Google will result in sources other than those in English language Google or other search engines.
Wikipedia articles created by users in other countries and languages is a mine of information that offers a different perspective or focus on a topic and corresponding cited references. Example: Cave Art article in Spanish Wikipedia ------ Arte Paleolítico.
RESEARCH TIP 1
While you may not understand the details of the Spanish text, write the names mentioned in the text and search English sources like Wikipedia and our library book catalog and databases to find unique information.
Example: The name of Henri Breuil stands out in the text from Spanish Wikipedia above under various theories interpreting the meaning of the cave art.
Tips for searching foreign sources on Google:
Example: "cave art" site:es
"cave art" site:fr
RESEARCH TIP 2
Search for sources on Google that come from educational or non-profit institutions such as, museums, cultural institutes, or government institutions by scoping to domains with EDU, ORG and GOV.
Example: "cave art" OR "paleolithic art" OR "prehistoric paintings" site: (edu OR org OR gov)
Use other search engines in addition to Google. One is the SweetSearch where each source in the results is carefully evaluated by experts.