Perhaps you should try some spelling variations:
coleccion practicas » coleccion practica, coleccion didactica, coleccion actas
economica mexicana » economia mexicana, economico mexicano, economica mexico
la economica » la economia, y economica, zona economica
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 practicas de la economica mexicana ((de cirugia) or (la cirugia)).~.
• If you are trying to use Boolean operators, they must be ALL CAPS: coleccion practicas de la economica mexicana ((de cirugia) OR (la cirugia)).*.