Perhaps you should try some spelling variations:
"instituto economico nacional" » "instituto tecnologico nacional", "estimulo economico nacional", "instituto academico nacional", "instituto economia nacional", "instituto economico regional", "instituto astronomico nacional"
"instituto tecnico nacional" » "instituto unico nacional", "instituto tecnico internacional", "instituto banco 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.

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