Perhaps you should try some spelling variations:
communication methods » communication media, communication model
oral communication » personal communication
technology credit » technology craft, technology crisis, technology media
clean development » human development, urban development
information gaps » information gap
methods clean » methods can, methods cell
gaps de » gaps do, camps de, gaps new
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: technology credit information gaps de oral communication methods clean development _ afrique.~.
• Adding a wildcard symbol may retrieve word variants: technology credit information gaps de oral communication methods clean development _ afrique.*.