Perhaps you should try some spelling variations:
"instituto tecnologico nacional" » "instituto tecnico nacional", "instituto tecnologico nacionales", "instituto geologico nacional"
"instituto pedagogico nacional" » "instituto pedagogica nacional", "instituto pedagogico tradicional", "instituto pedagogicos tradicional"
"instituto oncologico nacional" » "instituto ecologico nacional", "instituto oncologia nacional", "instituto deontologico nacional"

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