Perhaps you should try some spelling variations:
communication model » communication media
2.4 communication » 2.14 communication, 5.4 communication, 2.3 communication
green development » career development, driven development, uneven development
development des » development does, development desd, development ds
technology 3.3 » technology 3.1, technology 3.2, technology 2.3
3.3 isolation » 13.3 isolation, 3.1 isolation, 3.2 isolation
isolation gas » isolation haus, isolation task, isolation a
model green » model free, model tree, model degree
des afrique » en afrique, de l'afrique
gas price » gas prices
price 2.4 » prices 2.4, price 2.3, price 4.4

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

• Adding a wildcard symbol may retrieve word variants: technology 3.3 isolation gas price 2.4 communication model green development des afrique.*.