Perhaps you should try some spelling variations:
communications costs » communication costs, communications _
3.1 communications » 3.1 communication, 4.1 communication, 1.1 communication
developpement de » developpement des, developpement durable
technology does » technology debts, technology data, technology dlt
inflation rates » inflation rate
does inflation » der inflation, die inflation, core inflation
rates trade » states trade, rules trade, wages trade
trade 3.1 » trade 3.2, trade 4.1, trade 2.1

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

• Adding a wildcard symbol may retrieve word variants: technology does inflation rates trade 3.1 communications costs _ developpement de l'afrique.*.