Perhaps you should try some spelling variations:
coleccion practica » coleccion didactica
academico mexico » academicos mexico, academico excmo, academico leido
de cirugia » en cirugia, la cirugia
mexico de » mexicano de
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 de cirugia.~.
• Adding a wildcard symbol may retrieve word variants: coleccion practica ((del del) or (del dem)) academico mexico de cirugia.*.