Perhaps you should try some spelling variations:
training resources » learning resources, teaching resources
training resource » teaching resource, training research, training sources
learning course » learning curve, training course, learning curves
course series » courier services
e learning » _ learning

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: (( wbi ((training resource) OR (training resources)) studies. ) OR ( e learning course series. ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( wbi ((training resource) OR (training resources)) studies. ) or ( e learning course series. ))~".
• Adding a wildcard symbol may retrieve word variants: (( wbi ((training resource) OR (training resources)) studies. ) or ( e learning course series. ))*.