Perhaps you should try some spelling variations:
1990 communication » 10 communication, 19 communication, 1 communication
user information » der information, other information, user innovation
information case » information based, information can, information costs
technology user » technology users, technology use, technology used
2 developing » 3 developing, 4 developing, 2 development
developing a » developing _
case decade » last decade, past decade, cases decided
decade 1990 » decade 1996, decade 1997, decade 1930s
a africa » 1 africa, can africa, em africa
costs 2 » costs 20, costs _, costs 4

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

• Adding a wildcard symbol may retrieve word variants: technology user information case decade 1990 communication costs 2 developing a africa.*.