Perhaps you should try some spelling variations:
coleccion practica » coleccion didactica
academicos mexico » economicos mexico, academico excmo, catolicos mexico
academico leido » academico electo, academico aleman
practica de » practicas de
de cirugia » en cirugia
la 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 practica de la ((academicos mexico) OR (academico leido)) ((de cirugia) or (la cirugia)).~.
• If you are trying to use Boolean operators, they must be ALL CAPS: coleccion practica de la ((academicos mexico) OR (academico leido)) ((de cirugia) OR (la cirugia))..
• The words AND, OR and NOT may confuse the search; try adding quotes: "coleccion practica de la ((academicos mexico) OR (academico leido)) ((de cirugia) or (la cirugia)).".
• Adding a wildcard symbol may retrieve word variants: coleccion practica de la ((academicos mexico) OR (academico leido)) ((de cirugia) or (la cirugia)).*.