Perhaps you should try some spelling variations:
wang yang » wang yan, wang liang, wang yanling
yang can » yang fan, yang dean, yang yang
oil real » oil coal
oil rent » oil rents, oil trend
liang li » ling li, qiang li, liang wei
hong hai » shang hai, zhong tai, dang hai
lang li » ling li, tang li, wang li
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 yang can ((oil real) or (oil rent)) ((lang li) OR (liang li)) ((hong hai) or (hong yu)) ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang yang can ((oil real) OR (oil rent)) ((lang li) OR (liang li)) ((hong hai) OR (hong yu)) ;*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang yang can ((oil real) or (oil rent)) ((lang li) OR (liang li)) ((hong hai) or (hong yu)) ;*".