Perhaps you should try some spelling variations:
plant lice » plant life
wang yang » wang yan, wang liang, wang yanling
yang oil » yang zili, yang di, yang yi
plant li » plant life, plant oil, plant mix
hong hai » shang hai, zhong tai, dang hai
yang xi » yang di, yang yi, yang jui
hong yu » wong yue

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

• Performing a fuzzy search may retrieve terms with similar spellings: wang yang ((yang oil) or (yang xi)) coal ((plant li) OR (plant lice)) ((hong hai) or (hong yu)) ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang yang ((yang oil) OR (yang xi)) coal ((plant li) OR (plant lice)) ((hong hai) OR (hong yu)) ;.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang yang ((yang oil) or (yang xi)) coal ((plant li) OR (plant lice)) ((hong hai) or (hong yu)) ;".
• Adding a wildcard symbol may retrieve word variants: wang yang ((yang oil) or (yang xi)) coal ((plant li) OR (plant lice)) ((hong hai) or (hong yu)) ;*.