Perhaps you should try some spelling variations:
"instituto tecnico nacional" » "instituto tecnico internacional", "instituto banco nacional"
"instituto unico nacional" » "instituto clinico nacional", "instituto medico nacional", "instituto andino nacional", "instituto unidad nacional", "instituto banco nacional", "instituto liceo nacional"
"instituto oncologico nacional" » "instituto ecologico nacional", "instituto oncologia nacional", "instituto deontologico nacional"

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

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