Perhaps you should try some spelling variations:
yemen developpement » yemen development, en developpement, de developpement
data communication » data communications
developpement en » developpement et, developpement des, developpement de
technology 2.3 » technology 2.2, technology 2.1, technology 3.3
2.3 inflation » 2.3.1 inflation, 5.33 inflation, 2 inflation
rate base » rate band, rate bias, rate baskets
base data » based data, case data, basic data

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

• Adding a wildcard symbol may retrieve word variants: technology 2.3 inflation rate base data communication costs yemen developpement en afrique.*.