Perhaps you should try some spelling variations:
oral communication » personal communication
information costs » information contents, information centers, information content
developing areas » developing asia, developing east, developing a
4.1 developing » 3.1 developing, 4 developing, 3.3 developing
areas areas » areas arenas, seas areas, areas access
money oral » money moral, money oman
costs 4.1 » costs 4.2, costs 4.4, costs 4.3

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

• Adding a wildcard symbol may retrieve word variants: technologies _ information costs money oral communication costs 4.1 developing areas areas.*.