Perhaps you should try some spelling variations:
communications costs » communication costs, communications _
transfer infection » transfer innovation, transfer function, transfer reduction
3 communications » 3 communication, 2 communications, 4 communications
infection ratio » infection rates, infection rate, infection data
development l » development li, development 1, development law
ratio price » option price
l afrique » en afrique
price 3 » price _, price a, price 2.3
costs a » costs _, costs 4

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

• Adding a wildcard symbol may retrieve word variants: technology transfer infection ratio price 3 communications costs a development l afrique.*.