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

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