Perhaps you should try some spelling variations:
yang commodity » a commodity, farm commodity, gas commodity
crb commodity » core commodity, korb commodity, rmb commodity
can commodity » a commodity, can community, gas commodity
export book » export boom, export booms, export goods
export good » export goods, export boom

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((crb commodity) or (((can commodity) OR (yang commodity)))) ((export book) or (export good)) ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((crb commodity) OR (((can commodity) OR (yang commodity)))) ((export book) OR (export good)) ;.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((crb commodity) or (((can commodity) OR (yang commodity)))) ((export book) or (export good)) ;".
• Adding a wildcard symbol may retrieve word variants: ((crb commodity) or (((can commodity) OR (yang commodity)))) ((export book) or (export good)) ;*.