Perhaps you should try some spelling variations:
cause communication » causes communication, change communication, couple communication
development class » development case, development cross, development cases
technologies 2 » technologies _, technologies 4
class african » glass african, class americans, across african
a das » 1 das, 3 das, _ das
2 das » 1 das

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: "technologies 2 information ((a das) OR (2 das)) cause communication a 2 development class african.~".
• Adding a wildcard symbol may retrieve word variants: technologies 2 information ((a das) OR (2 das)) cause communication a 2 development class african.*.