Perhaps you should try some spelling variations:
22primary commodities » primary commodities, primary commodity
primary commoditie » primary commodities, primary commodity, primary competitive
61 developing » 6.1 developing, 11 developing, 21 developing
1 developing » 1 development

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: %((22primary commodities) OR (primary commoditie)) %((61 developing) OR (1 developing)) countries%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%((22primary commodities) OR (primary commoditie)) %((61 developing) or (1 developing)) countries%22".
• Adding a wildcard symbol may retrieve word variants: %((22primary commodities) OR (primary commoditie)) %((61 developing) or (1 developing)) countries%22*.