Perhaps you should try some spelling variations:
"instituto tecnologico nacional" » "instituto oncologico nacional", "instituto tecnico nacional", "instituto pedagogico nacional", "instituto tecnologico nacionales"
"instituto neurologico nacional" » "instituto oncologico nacional", "instituto pedagogico nacional", "instituto tecnologico nacionales", "instituto astronomico nacional"
"instituto geologico nacional" » "instituto oncologico nacional", "instituto agroecologico nacional", "instituto pedagogico nacional", "instituto geologico regional"

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("instituto geologico nacional") or ((("instituto neurologico nacional") OR ("instituto tecnologico nacional"))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("instituto geologico nacional") OR ((("instituto neurologico nacional") OR ("instituto tecnologico nacional")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"instituto geologico nacional\") or (((\"instituto neurologico nacional\") OR (\"instituto tecnologico nacional\"))))".
• Removing quotes may allow a broader search: (( instituto geologico nacional ) or ((( instituto neurologico nacional ) OR ( instituto tecnologico nacional )))).
• Adding a wildcard symbol may retrieve word variants: (("instituto geologico nacional") or ((("instituto neurologico nacional") OR ("instituto tecnologico nacional"))))*.