Perhaps you should try some spelling variations:
communication cost » communication costs, communication costa, communications costs
technology use » technology 1, technology 2.2, technology 3
use regularity » use regulation, _ regularity, 3 regularity
prices mobile » services mobile, prices middle, prices more
regularity 5 » regularity _, regularity 1, regularity 2
cost sector » cost vector, port sector, forest sector
china part » china past, china pearl, china path
5 prices » 2 prices, 5 price, 5 process

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

• Adding a wildcard symbol may retrieve word variants: technology use regularity 5 prices mobile communication cost sector development china part.*.