Perhaps you should try some spelling variations:
developpement du » developpement de, developpement des, developpement et
4 communication » 3 communication, 5.4 communication, de communication
technology 4 » technology _, technology 1, technology 3
4 election » _ election, _ elections, 2 elections
du afrique » en afrique, l afrique, de l'afrique
law rate » flow rate, law state, law re
low rate » flow rate, low water, low rank

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "technology 4 election ((law rate) OR (low rate)) 4 communication costs _ developpement du afrique.~".
• Adding a wildcard symbol may retrieve word variants: technology 4 election ((law rate) OR (low rate)) 4 communication costs _ developpement du afrique.*.