Perhaps you should try some spelling variations:
22language acquisition » language acquisition, interlanguage acquisition, bilingual acquisition
language acquistion » language acquisition, language question, language action
langage acquisition » language acquisition, image acquisition, planning acquisition
land acquisition » language acquisition

Try widening your search to All Fields.

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

• If you are trying to use Boolean operators, they must be ALL CAPS: %((22language acquisition) OR (((language acquistion) OR (((langage acquisition) OR (land acquisition)))))) AND development%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%((22language acquisition) or (((language acquistion) or (((langage acquisition) OR (land acquisition)))))) and development%22".
• Adding a wildcard symbol may retrieve word variants: %((22language acquisition) or (((language acquistion) or (((langage acquisition) OR (land acquisition)))))) and development%22*.