Perhaps you should try some spelling variations:
oral communication » personal communication
technologies 2.1 » technologies _, technologies 4, technologies a
developing aside » developing asia, developing asian, developing asia's
2.1 information » 3.1 information
information 2 » information 3
4 developing » 3 developing
aside areas » marine areas, alpine areas, saline areas
de oral » de otras, new oral
costs 4 » costs _, costs a, costs 4.2
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 2.1 information 2 de oral communication costs 4 developing aside areas.*.