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
oil coal » oil cost, oil can, oil chad
plant li » plant life, plant oil, plant mix
hong hai » shang hai, zhong tai, dang hai
wong yue » wang yue, hong yu
oil oil » coal oil

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