Perhaps you should try some spelling variations:
communication skills » communication services, communication systems
oral communication » personal communication
clean development » human development, urban development
technologies new » technologies _, technologies 4, technologies 2
new information » 2 information
skills clean » skills can, spills cleanup, skills create
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: technologies new information about de oral communication skills clean development _ afrique.~.
• Adding a wildcard symbol may retrieve word variants: technologies new information about de oral communication skills clean development _ afrique.*.