Perhaps you should try some spelling variations:
wang yong » wang yang, wang hyoung, wang yan
yong yan » yang yang, dong yang, ying yang
oil rent » oil rents, oil trend, oil real
hong hai » shang hai, zhong tai, dang hai
yan oil » can oil, oman oil, than oil
hong yu » wong yue
tang » tan, lang, yang

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

• Performing a fuzzy search may retrieve terms with similar spellings: wang yong yan oil rent tang li ((hong hai) OR (hong yu)) ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang yong yan oil rent tang li ((hong hai) OR (hong yu)) ;*".