Perhaps you should try some spelling variations:
small farmers » small firms
jui small » i small, iii small
using dem » using dhm, using deep, using ddms
using dea » using dna, using delta, using ideal
yin yang » ying yang, yi yang, yin fang
yang jui » yang judy, yang di, yang xi
yu wang » yue wang, yu fang, yu gang

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((yin yang) or (yu wang)) yang jui small farmers ((using dem) OR (using dea)) bei ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((yin yang) OR (yu wang)) yang jui small farmers ((using dem) OR (using dea)) bei ;*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((yin yang) or (yu wang)) yang jui small farmers ((using dem) OR (using dea)) bei ;*".