Perhaps you should try some spelling variations:
frontiers collection » frontiers selection, containers collection, folders collection
folders connections » orders connections, models connections, codes connections
frontier section » frontier region, frontier second, frontier functions

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