Perhaps you should try some spelling variations:
technology trends » technology thesis, technology trade, technology tools
trends infection » trends section, trends affecting, sinks infection
mine development » sme development, trade development, business development
infection rates » inflation rates
1 afrique » l afrique, en afrique, 1 enrique
pre 2 » pre _, pro 2, pre α

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 trends infection rates ((pre 2) OR (ppe 2)) communication _ mine development 1 afrique.~".
• Adding a wildcard symbol may retrieve word variants: technology trends infection rates ((pre 2) OR (ppe 2)) communication _ mine development 1 afrique.*.