Perhaps you should try some spelling variations:
communications costs » communication costs, communications _
3.1 communications » 3.1 communication, 4.1 communication, 1.1 communication
dlt interaction » data interaction, dem interaction, depth interaction
developpement l » developpement il, developpement la, developpement de
technology dlt » technology data, technology debts, technology 21st
l afrique » en afrique
from 3.1 » from 1.1b, from 9.14, strom 3.1

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

• Adding a wildcard symbol may retrieve word variants: technology dlt interaction effects from 3.1 communications costs _ developpement l afrique.*.