Perhaps you should try some spelling variations:
communication cost » communication costs, communication costa, communications costs
models development » model development, module development, model developments
4.2 communication » 4.2 communications, 3.2 communication, 4.1 communication
technology rate » technology state, technology role, technology related
inflation rates » inflation rate
rate inflation » grade inflation, wage inflation, age inflation
development en » developpement en, development menu, development eco
cost models » cost model, logit models
space 4.2 » space 3.2, space 2.2, space 4.3

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

• Adding a wildcard symbol may retrieve word variants: technology rate inflation rates space 4.2 communication cost models development en afrique.*.