Perhaps you should try some spelling variations:
communication cost » communication costs, communication costa, communications costs
formulation where » formulation over, formulation des, calculation where
der communication » de communication, under communication, debt communication
child development » world development
development main » development making, development moving, development mode
main afrique » en afrique
cost child » boost child, cbt child, out child
where x » where _, where i, where a
x der » _ der, 2 der, 3 der

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

• Adding a wildcard symbol may retrieve word variants: technologies _ formulation where x der communication cost child development main afrique.*.