Perhaps you should try some spelling variations:
tough communication » trough communication, touch communication, through communication
communication cost » communication costs, communication costa, communications costs
models development » model development, module development, model developments
transfer relation » transfer relations, transfer operation, transfer reduction
cost models » cost model, logit models
fund due » fund fee

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

• Adding a wildcard symbol may retrieve word variants: technology transfer relation _ times tough communication cost models development fund due.*.