Perhaps you should try some spelling variations:
communication cost » communication costs, communication costa, communications costs
gdp communication » de communication, amp communication, up communication
technologies 2 » technologies _, technologies 4
3.3 developing » 4 developing, 2 developing, 1 developing
information 2 » information 3
cost 3.3 » cost 3.2, cost 2.3, cost 3.4
2 debt » 3 debt, 4 debt, 2.5 debt

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

• Adding a wildcard symbol may retrieve word variants: technologies 2 information 2 debt gdp communication cost 3.3 developing _ area.*.