Perhaps you should try some spelling variations:
communications costs » communication costs, communications _
clean development » human development, urban development
technology 2.1 » technology 2.2, technology 3.1, technology 1
2.1 inflation » 2.3 inflation, 2.3.1 inflation, 2 inflation
inflation und » inflation index, inflation _, inflation tax
costs clean » costs clear
base data » based data, case data, basic data
1 afrique » l afrique, en afrique, 1 enrique
und base » und basel, land base, und baden

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 und base data communications costs clean development 1 afrique.*.