Perhaps you should try some spelling variations:
oral communication » personal communication
developing areas » developing asia, developing east, developing a
information age » information storage, information access, information about
4 developing » 3 developing
areas africa » arabs africa, dress africa, farmers africa
des oral » des moral, des oil, des orts
age des » lage des, auge des, age de
costs 4 » costs _, costs a, costs 4.2

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

• Performing a fuzzy search may retrieve terms with similar spellings: technologies _ information age des oral communication costs 4 developing areas africa.~.
• Adding a wildcard symbol may retrieve word variants: technologies _ information age des oral communication costs 4 developing areas africa.*.