Perhaps you should try some spelling variations:
technologies 2.1 » technologies _, technologies 4, technologies a
10 communication » 1 communication, de communication, 3 communication
developing areas » developing asia, developing east, developing a
2.1 information » 3.1 information
4.4 developing » 5.4 developing, 6.4 developing, 1.4 developing
areas silk » areas silvio
costs 4.4 » costs 4.2

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

• Adding a wildcard symbol may retrieve word variants: technologies 2.1 information contents _ 10 communication costs 4.4 developing areas silk.*.