Perhaps you should try some spelling variations:
economicos mexicana » economico mexicano, economicos mexico, economia mexicana
coleccion practica » coleccion didactica
economica mexicana » economia mexicana, economico mexicano, economica mexico
practica de » practicas de
de y » de _, de a, de 3

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 y ((economicos mexicana) OR (economica mexicana)) en cirugia.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "coleccion practica de y ((economicos mexicana) OR (economica mexicana)) en cirugia.".
• Adding a wildcard symbol may retrieve word variants: coleccion practica de y ((economicos mexicana) OR (economica mexicana)) en cirugia.*.