Perhaps you should try some spelling variations:
projection learning » projects learning, prediction learning, propagation learning
22adult learning » adult learning, adults learning, adt learning
project learning » project planning, project running
project defining » project definition, project planning, project design

Try widening your search to All Fields.

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: %((22adult learning) OR (((projection learning) OR (((project learning) OR (project defining))))))%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%((22adult learning) or (((projection learning) or (((project learning) OR (project defining))))))%22".
• Adding a wildcard symbol may retrieve word variants: %((22adult learning) or (((projection learning) or (((project learning) OR (project defining))))))%22*.