Perhaps you should try some spelling variations:
models developpement » models development, model development, de developpement
communication cost » communication costs, communication costa, communications costs
3.2 communication » 3 communication, 2.3 communication, de communication
developpement en » developpement et, developpement des, developpement de
technology can » technology change, technology 1, technology 2.2
can inflation » ein inflation, has inflation, von inflation
rate states » state states, data states, rate estimates
cost models » cost model, logit models
states 3.2 » states 4.1

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

• Adding a wildcard symbol may retrieve word variants: technology can inflation rate states 3.2 communication cost models developpement en afrique.*.