Perhaps you should try some spelling variations:
wang yang » wang yan, wang liang, wang yanling
yang yang » wang yan
shang hai » shang kai, dang hai, chang ha
zhong tai » hong tan, hong hai, zhong zhi
oil coal » oil cost, oil oil, oil chad
wong yue » wang yue, hong yu
oil can » oil cake, oil chad

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

• Performing a fuzzy search may retrieve terms with similar spellings: wang yang yang ((oil can) OR (oil coal)) ling li ((((shang hai) or (zhong tai))) or (wong yue)) ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang yang yang ((oil can) OR (oil coal)) ling li ((((shang hai) OR (zhong tai))) OR (wong yue)) ;*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang yang yang ((oil can) OR (oil coal)) ling li ((((shang hai) or (zhong tai))) or (wong yue)) ;*".