Perhaps you should try some spelling variations:
coleccion practicas » coleccion practica, coleccion didactica, coleccion actas
y academica » y academia, y academicos, _ academic
y academico » y academicos, lo academico, un academico
una cirugia » en cirugia, la cirugia, para cirugia
a cirugia » la cirugia, y cirugia, en cirugia

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

• Performing a fuzzy search may retrieve terms with similar spellings: coleccion practicas de ((y academica) or (y academico)) mexicana ((una cirugia) OR (a cirugia)).~.
• If you are trying to use Boolean operators, they must be ALL CAPS: coleccion practicas de ((y academica) OR (y academico)) mexicana ((una cirugia) OR (a cirugia))..
• The words AND, OR and NOT may confuse the search; try adding quotes: "coleccion practicas de ((y academica) or (y academico)) mexicana ((una cirugia) OR (a cirugia)).".
• Adding a wildcard symbol may retrieve word variants: coleccion practicas de ((y academica) or (y academico)) mexicana ((una cirugia) OR (a cirugia)).*.