Perhaps you should try some spelling variations:
communication cost » communication costs, communication costa, communications costs
4 communication » 3 communication, 5.4 communication, de communication
envelopment lid » development lid, development led, development li
technology 2.1 » technology 2.2, technology 3.1, technology 1
2.1 inflation » 2.3 inflation, 2.3.1 inflation, 2 inflation
inflation 4 » inflation _, inflation a, inflation 1
lid afrique » l afrique
cost data » test data
4 advice » _ advice, 7 advice, i advice
advice 4 » advice _, advice 7, advice 1

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

• Adding a wildcard symbol may retrieve word variants: technology 2.1 inflation 4 advice 4 communication cost data envelopment lid afrique.*.