Perhaps you should try some spelling variations:
developed countries » developing countries
technology support » technology sector
support operations » port operations, airport operations, transport operations
oral communication » personal communication
countries april » countries africa
operations 6.1 » operations 16.1, operations 2.1, operations 5.1
4 developed » _ developed, a developed, 1 developed
costs 4 » costs _, costs a, costs 4.2

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

• Adding a wildcard symbol may retrieve word variants: technology support operations 6.1 _ oral communication costs 4 developed countries april.*.