Perhaps you should try some spelling variations:
yang yang » wang yang, wang yan
oil rent » oil rents, oil trend, oil real
hong hai » shang hai, zhong tai, dang hai
yan yan » yan yuan, wang yan, qian yan
nan yan » nan ya, wang yan, qian yan
lang li » liang li, ling li, tang li
hong yu » wong yue
wang » wing, wan

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

• Performing a fuzzy search may retrieve terms with similar spellings: wang ((((yan yan) OR (yang yang))) or (nan yan)) oil rent lang li ((hong hai) or (hong yu)) ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang ((((yan yan) OR (yang yang))) OR (nan yan)) oil rent lang li ((hong hai) OR (hong yu)) ;.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang ((((yan yan) OR (yang yang))) or (nan yan)) oil rent lang li ((hong hai) or (hong yu)) ;".
• Adding a wildcard symbol may retrieve word variants: wang ((((yan yan) OR (yang yang))) or (nan yan)) oil rent lang li ((hong hai) or (hong yu)) ;*.