Perhaps you should try some spelling variations:
coleccion practica » coleccion didactica
practica de » practicas de
a academica » y academica, a academicos, y academicas
_ academica » _ academic, y academica, y academicas
4 cirugia » a cirugia, 8 cirugia, 9 cirugia
y cirugia » en cirugia, de cirugia, la 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 ((a academica) OR (_ academica)) durante ((4 cirugia) OR (y cirugia)).~.
• Adding a wildcard symbol may retrieve word variants: coleccion practica de ((a academica) or (_ academica)) durante ((4 cirugia) or (y cirugia)).*.