Perhaps you should try some spelling variations:
frontiers collection » frontiers selection, containers collection, reuters collection
containers creation » containers creating, container creating, containers section
folders collection » folders connections, holders collective, leaders collection
frontiers section » frontier section
frontier electron » frontier electronic, frontiers selection, frontier section

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: %22the ((((((((frontiers collection) OR (frontiers section))) OR (containers creation))) OR (folders collection))) OR (frontier electron))%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22the ((((((((frontiers collection) OR (frontiers section))) or (containers creation))) or (folders collection))) or (frontier electron))%22".
• Adding a wildcard symbol may retrieve word variants: %22the ((((((((frontiers collection) OR (frontiers section))) or (containers creation))) or (folders collection))) or (frontier electron))%22*.