Perhaps you should try some spelling variations:
dong yang » dong hoang, wang yang, dan yang
yang yang » wang yang, wang yan
oil rent » oil rents, oil trend, oil real
hong hai » shang hai, zhong tai, dang hai
di rent » des rent, der rent
gang li » gan 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 ((dong yang) OR (yang yang)) ((di rent) or (oil rent)) gang li ((hong hai) or (hong yu)) ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang ((dong yang) OR (yang yang)) ((di rent) OR (oil rent)) gang li ((hong hai) OR (hong yu)) ;.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang ((dong yang) OR (yang yang)) ((di rent) or (oil rent)) gang li ((hong hai) or (hong yu)) ;".
• Adding a wildcard symbol may retrieve word variants: wang ((dong yang) OR (yang yang)) ((di rent) or (oil rent)) gang li ((hong hai) or (hong yu)) ;*.