Perhaps you should try some spelling variations:
shang hai » shang kai, dang hai, chang ha
coal lang » coal plant
oil coal » oil cost, oil oil, oil can
wang yue » wong yue, wang hua, wang he
yan can » yan clan, man can, yan cong
can oil » can soils, can only, corn oil
lang li » liang li, ling li, tang li

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 yan can oil coal lang li ((shang hai) OR (wang yue)) ;~.
• Adding a wildcard symbol may retrieve word variants: wang yan can oil coal lang li ((shang hai) or (wang yue)) ;*.