Perhaps you should try some spelling variations:
country variables » control variables, country parable, country variance
developed country » developed countries, developing country
information lost » information loss, information cost, information list
a communication » la communication, data communication, data communications
technology 1 » technology _
lost decades » lost decade, last decades, last decade
60 developed » 6 developed, 2.0 developed, 6.1 developed
decades a » decades _, decade _, decade 1
costs 60 » costs 20, costs 6.4, costs 168

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

• Adding a wildcard symbol may retrieve word variants: technology 1 information lost decades a communication costs 60 developed country variables.*.