Perhaps you should try some spelling variations:
change information » chandos information, trade information
oral communication » personal communication
technical change » technological change
development case » development china
about de » about due, about dead, about debt
de oral » de otras, new oral

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

• Performing a fuzzy search may retrieve terms with similar spellings: technical change information about de oral communication costs _ development case afrique.~.
• Adding a wildcard symbol may retrieve word variants: technical change information about de oral communication costs _ development case afrique.*.