Perhaps you should try some spelling variations:
"lnvestigacion transformadoras del servicio" » "lnvestigacion transformativa del servicio", "investigacion transformacion del servicio", "lnvestigacion transformadora del servicio", "lnvestigacion transformadoras de servicio", "lnvestigacion transformadora de servicio"
"investigacion asociativa del servicio" » "investigacion asociacion del servicio", "investigacion educativa del servicio", "investigacion formativa del servicio", "investigacion asociativa de servicio", "investigacion asociativo del servicio", "investigacion asociativo de servicio"

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: (("investigacion asociativa del servicio") or ("lnvestigacion transformadoras del servicio"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("investigacion asociativa del servicio") OR ("lnvestigacion transformadoras del servicio")).
• Removing quotes may allow a broader search: (( investigacion asociativa del servicio ) or ( lnvestigacion transformadoras del servicio )).
• Adding a wildcard symbol may retrieve word variants: (("investigacion asociativa del servicio") or ("lnvestigacion transformadoras del servicio"))*.