Perhaps you should try some spelling variations:
clean development » human development, urban development
information case » information based, information can, information costs
efforts clean » efforts dean, exports clean, efforts real
china april » china africa
case de » case des, case d, case d1
de mass » de masse, de mais, de masa

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

• Performing a fuzzy search may retrieve terms with similar spellings: technology _ information case de mass communication efforts clean development china april.~.
• Adding a wildcard symbol may retrieve word variants: technology _ information case de mass communication efforts clean development china april.*.