Perhaps you should try some spelling variations:
oral communication » personal communication
information case » information based, information can, information costs
technologies 2 » technologies _, technologies 4
4.3 developing » 3.3 developing, 1.3 developing, 7.3 developing
costs 4.3 » costs 4.2, costs 4.4, costs 2.3
case u.s » case 4.1, case 4.2, case 2.3
u.s oral » u.s oil

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

• Adding a wildcard symbol may retrieve word variants: technologies 2 information case u.s oral communication costs 4.3 developing _ access.*.