Perhaps you should try some spelling variations:
coleccion practica » coleccion didactica
academico mexico » academicos mexico, academico excmo, economico mexico
academico leido » academico electo, academicos mexico, academico aleman
la cirugia » en cirugia, de cirugia
del del » edel del, del de, del des
del dem » del de, del des, el dem

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 ((del del) OR (del dem)) ((academico mexico) OR (academico leido)) la cirugia.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "coleccion practica ((del del) or (del dem)) ((academico mexico) OR (academico leido)) la cirugia.~".
• Adding a wildcard symbol may retrieve word variants: coleccion practica ((del del) or (del dem)) ((academico mexico) OR (academico leido)) la cirugia.*.