Perhaps you should try some spelling variations:
communications costs » communication costs, communications _
sector interactions » actor interactions, vector interaction, sector interventions
oman communications » human communications, iran communications, romania communications
techniques sector » techniques vector, techniques section, techniques history
interactions et » interactions pt, interactions best, interactions few
4.1 development » 3.1 development, 2.1 development, 2.3 development
data oman » data man, data human, data ocean
costs 4.1 » costs 4.2, costs 4.4, costs 4.3
1 afrique » l afrique, en afrique, 1 enrique
et data » det data, pet data, set data

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

• Adding a wildcard symbol may retrieve word variants: techniques sector interactions et data oman communications costs 4.1 development 1 afrique.*.