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

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 (langage acquisition))) OR (((language acquistion) OR (language acquisition)))) AND development%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%((((22language acquisition) OR (langage acquisition))) or (((language acquistion) or (language acquisition)))) and development%22".
• Adding a wildcard symbol may retrieve word variants: %((((22language acquisition) OR (langage acquisition))) or (((language acquistion) or (language acquisition)))) and development%22*.