Perhaps you should try some spelling variations:
12.4 communication » 1.4 communication, 2.4 communication, 12.2.4 communication
communication cost » communication costs, communication costa, communications costs
models development » model development, module development, model developments
development east » development southeast, development 1
information tb » information two, information 2, information 1
4 information » 2 information, 1 information
technology 4 » technology _, technology 1, technology 3
cost models » cost model, logit models
east africa » west africa
case 12.4 » case 1.4, case 2.4, case 2.3

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

• Adding a wildcard symbol may retrieve word variants: technology 4 information tb case 12.4 communication cost models development east africa.*.