Perhaps you should try some spelling variations:
communication costs » communication systems, communication efforts, communication skills
change information » trade information, chief information
oral communication » mobile communication, _ communication, risk communication
technical change » technological change
information age » information gaps, information laws, information _
development a » development _, development bank, development banks

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 age de oral communication costs _ development a afrique.~.
• Adding a wildcard symbol may retrieve word variants: technical change information age de oral communication costs _ development a afrique.*.