Perhaps you should try some spelling variations:
communication mode » communication model, communication modes, communication module
a communication » la communication, data communication, data communications
development 1.1 » development 2.1, development 2.3, development 2.2
c development » 2 development, 1 development, gcc development
1.1 afrique » 2014 afrique
a prices » 2 prices, gas prices, tea prices
a price » a primer
mode c » mode _, mode 1, mode 3

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "technology _ inflation ((a prices) OR (a price)) a communication mode c development 1.1 afrique.~".
• Adding a wildcard symbol may retrieve word variants: technology _ inflation ((a prices) OR (a price)) a communication mode c development 1.1 afrique.*.