Perhaps you should try some spelling variations:
developing control » developing country, developed control, developing countriesl
information last » information list, information lost, information law
la communication » data communication, data communications
last decades » last decade, lost decade, past decade
4 developing » 3 developing
decades la » decades a, decades _, decade a
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 _ information last decades la communication costs 4 developing control variables.*.