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

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 (language 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 (language acquisition)))) and development%22".
• Adding a wildcard symbol may retrieve word variants: %((22language acquisition) or (((((language acquistion) OR (langage acquisition))) or (language acquisition)))) and development%22*.