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

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

• Performing a fuzzy search may retrieve terms with similar spellings: wang wang yang oil coal ((plant li) or (plant lice)) ((hong hai) or (wang yue)) ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang wang yang oil coal ((plant li) OR (plant lice)) ((hong hai) OR (wang yue)) ;.
• Adding a wildcard symbol may retrieve word variants: wang wang yang oil coal ((plant li) or (plant lice)) ((hong hai) or (wang yue)) ;*.