Perhaps you should try some spelling variations:
coleccion practica » coleccion didactica
academica durante » academico docente, economica durante, academica diana
america durante » iberica durante
practica de » practicas de
de cirugia » en cirugia, la cirugia
a cirugia » la cirugia, y cirugia, en cirugia

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