Perhaps you should try some spelling variations:
"instituto tecnico operacional" » "instituto tecnico operacion", "instituto tecnico internacional", "instituto tecnico nacional"
"instituto oncologia nacional" » "instituto oncologico nacional", "institucion oncologica nacional", "instituto oncol nacional", "instituto ontologia relacional", "instituto economia nacional"
"instituto tecnico relacional" » "instituto tecnica relacionada", "instituto tecnico nacional", "instituto tecnicos relacionados"

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