Perhaps you should try some spelling variations:
dong yang » dong hoang, yang yang, dan yang
wang yang » wang yan, wang liang, wang yanling
oil rent » oil rents, oil trend, oil real
hong hai » shang hai, zhong tai, dang hai
di rent » des rent, der rent
hong yu » wong yue
tang » tan, lang, gang

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