Perhaps you should try some spelling variations:
22realidad aumentada » realidad aumentada (Expand Search), realidad aumenta (Expand Search)
ada educativa » agenda educativa (Expand Search), calidad educativa (Expand Search)
b3n primaria » en primaria (Expand Search), de primaria (Expand Search), la primaria (Expand Search)
su aplicaci » su aplicacion (Expand Search)
2c ciencias » de ciencias (Expand Search), y ciencias (Expand Search), en ciencias (Expand Search)
ciencias b » ciencias de (Expand Search), ciencias en (Expand Search), ciencia y (Expand Search)
educaci%c3%b3n » educacio%c3%b3n (Expand Search), educacin%c3%b3n (Expand Search), educsci%c3%b3n (Expand Search)
tecnolog%c3%ada » tecnologia%c3%ada (Expand Search), technology%c3%ada (Expand Search), tecnol%c3%ada (Expand Search)

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: %22realidad aumentada%((2c aplicaci) OR (su aplicaci))%c3%b3n educativa%2c educaci%c3%b3n primaria%2c tecnolog%c3%ada educativa%2c ciencias b%c3%a1sicas.%22~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22realidad aumentada%((2c aplicaci) OR (su aplicaci))%c3%b3n educativa%2c educaci%c3%b3n primaria%2c tecnolog%c3%ada educativa%2c ciencias b%c3%a1sicas.%22".
• Adding a wildcard symbol may retrieve word variants: %22realidad aumentada%((2c aplicaci) OR (su aplicaci))%c3%b3n educativa%2c educaci%c3%b3n primaria%2c tecnolog%c3%ada educativa%2c ciencias b%c3%a1sicas.%22*.