Perhaps you should try some spelling variations:
academica mexicana » academia mexicana, academica diana, polemica mexicana
coleccion practica » coleccion didactica
economica mexicana » economia mexicana, economico mexicano, economica mexico
y cirugia » en cirugia, de cirugia, la cirugia
de y » de _, de a, fe y
de 3 » de _, de a

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: coleccion practica ((de y) OR (de 3)) ((academica mexicana) OR (economica mexicana)) y cirugia.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "coleccion practica ((de y) or (de 3)) ((academica mexicana) OR (economica mexicana)) y cirugia.~".
• Adding a wildcard symbol may retrieve word variants: coleccion practica ((de y) or (de 3)) ((academica mexicana) OR (economica mexicana)) y cirugia.*.