Perhaps you should try some spelling variations:
developpement durable » developpement de
3.4 communication » 5.4 communication, 3.2 communication, 3.5 communication
technology has » technology hard, technology have, technology how
has inflation » how inflation, u.s inflation, cases inflation
inflation der » inflation index, inflation _, inflation tax
der ratio » der rat, der rate, gender ratio
ratio 3.4 » ratio 3.3, ratio 2.4, ratio 3.2

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

• Adding a wildcard symbol may retrieve word variants: technology has inflation der ratio 3.4 communication costs _ developpement durable afrique.*.