Perhaps you should try some spelling variations:
communications challenge » communication challenge, communication challenges, telecommunications challenges
de communications » de communication, do communications, mce communications
river development » driven development, water development, power development
development class » development case, development cross, development cases
challenge river » challenge driven, challenges drivers, challenge after
technologies a » technologies _, technologies 4, technologies 2
a information » 2 information, 1 information
information 1 » information 2, information 3, information 3.2
class african » glass african, class americans, across african
2 de » 2 die, 2 der, _ de

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

• Adding a wildcard symbol may retrieve word variants: technologies a information 1 2 de communications challenge river development class african.*.