Perhaps you should try some spelling variations:
communication cost » communication costs, communication costa, communications costs
validation method » validation methods, valuation method, calibration method
de communication » mobile communication, online communication
data development » delta development, doha development, data envelopment
method success » methods access, methods successful
technology de » technology does, technology dlt, technology 1
de validation » _ validation, 4 validation, 3 validation
success de » success made, success get, success one
cost data » test data

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

• Adding a wildcard symbol may retrieve word variants: technology de validation method success de communication cost data development china a.*.