Perhaps you should try some spelling variations:
communication model » communication media
3.1 communication » 3.1 communications, 3.2 communication, 3.5 communication
cdm developpement » de developpement, du developpement, cdm development
developpement en » developpement et, developpement des, developpement de
inflation gold » inflation good, inflation gerold, inflation gopi
gold price » gold prices, world price, food price
price 3.1 » prices 3.1, rice 3.1, price 3.2
model cdm » model ccm, model code, model capm

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

• Adding a wildcard symbol may retrieve word variants: technology _ inflation gold price 3.1 communication model cdm developpement en afrique.*.