Perhaps you should try some spelling variations:
doctorandos de » doctorales de
de maestros » del maestro, los maestros
maestros de » maestro de
doctoral de » doctorales de, doctor de, doctoral en
dar planta » para planta, la planta, de planta
para dar » para dejar, para a
textos » texto

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

• Performing a fuzzy search may retrieve terms with similar spellings: textos para dar planta de maestros de ((doctoral de) or (doctorandos de)) fisica.~.
• If you are trying to use Boolean operators, they must be ALL CAPS: textos para dar planta de maestros de ((doctoral de) OR (doctorandos de)) fisica..
• Adding a wildcard symbol may retrieve word variants: textos para dar planta de maestros de ((doctoral de) or (doctorandos de)) fisica.*.