Perhaps you should try some spelling variations:
manuals administrativos » manuales administrativos, marcos administrativos, generales administrativos
parra economista » garcia economista, correa economista, perez economista
para economizar » para descolonizar
para economia » otra economia, obra economia, la economia
el derecho » del derecho

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

• Performing a fuzzy search may retrieve terms with similar spellings: manuals administrativos ((((para economia) OR (parra economista))) or (para economizar)) el derecho~.
• If you are trying to use Boolean operators, they must be ALL CAPS: manuals administrativos ((((para economia) OR (parra economista))) OR (para economizar)) el derecho.
• The words AND, OR and NOT may confuse the search; try adding quotes: "manuals administrativos ((((para economia) OR (parra economista))) or (para economizar)) el derecho".
• Adding a wildcard symbol may retrieve word variants: manuals administrativos ((((para economia) OR (parra economista))) or (para economizar)) el derecho*.