Perhaps you should try some spelling variations:
plant lice » plant life
wang wang » wang yang, wang liang, wang yan
wang can » wang yan, wang ban, wang dan
oil coal » oil cost, oil oil, oil can
plant li » plant life, plant oil, plant mix
hong hai » shang hai, zhong tai, dang hai
can oil » can soils, can only, corn oil
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 wang can oil 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 wang can oil coal ((plant li) OR (plant lice)) ((hong hai) OR (hong yu)) ;.
• Adding a wildcard symbol may retrieve word variants: wang wang can oil coal ((plant li) or (plant lice)) ((hong hai) or (hong yu)) ;*.