Perhaps you should try some spelling variations:
shang hai » shang kai, dang hai, chang ha
oil coal » oil cost, oil oil, oil can
plant li » plant life, plant lice, plant mix
wong yue » wang yue, hong yu
man han » man hat, man can, man kann
han oil » than oil, can oil, han gil
wang » wing, lang

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

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