Perhaps you should try some spelling variations:
4.1 communication » 4 communication, 2.3 communication, 3.2 communication
technology costs » technology cost, technology course, technology case
costs innovation » cost innovation, foster innovation, costs information
innovation data » innovation das, innovative data, innovation david
del development » model development, delta development, well development
sources 4.1 » sources 1.1, sources 3.1, sources 4.2
costs del » costa del, costo del
1 afrique » l afrique, en afrique, 1 enrique

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

• Adding a wildcard symbol may retrieve word variants: technology costs innovation data sources 4.1 communication costs del development 1 afrique.*.