Perhaps you should try some spelling variations:
learning resource » learning resources, learning research, teaching resource
learning centres » learning centers, training centres, learning contexts
resource series » resource studies, resource survey, resource settings
learning curves » learning curve, learning centers
wbi learning » _ learning, e learning, a learning

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( wbi learning resource series. ) or ( wbi ((learning curves) OR (learning centres)) series. ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( wbi learning resource series. ) OR ( wbi ((learning curves) OR (learning centres)) series. ))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( wbi learning resource series. ) or ( wbi ((learning curves) OR (learning centres)) series. ))*".