Perhaps you should try some spelling variations:
communication costs » communication systems, communication efforts, communication skills
price information » private information, price inflation
information needs » information flows, information networks
clean development » human development, urban development, child development
technology price » technology private, technology policy, technology choice
development co » development _, development a, development case
needs de » needs _, needs a

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

• Adding a wildcard symbol may retrieve word variants: technology price information needs de _ communication costs clean development co afrique.*.