Perhaps you should try some spelling variations:
learners training » teachers training, farmers training, learning training
training based » tracking based, training case, training basics
crop transport » from transport, carbon transport, europe transport
from learners » from leaders, from learning, slow learners
based tasks » based task, based tests, basic tasks
transport a » transport _, transport data
bias der » bias des, bias over, das der
der crop » der cross, new crop, der cap
a ao » a a, a co, a o

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (( (aguas OR agua) from learners training based tasks ) OR ( bias der crop transport a ao ))~.
• Adding a wildcard symbol may retrieve word variants: (( (aguas or agua) from learners training based tasks ) or ( bias der crop transport a ao ))*.