Perhaps you should try some spelling variations:
wang tan » wang yan, wang ban, wang tao
wang dan » wang yan, wang ban, wang yidan
oman oil » oman till, ogn oil, than oil
can lang » can laugh, can plant, lang lang
hong hai » shang hai, zhong tai, dang hai
can oil » can soils, can only, corn oil
lang li » liang li, ling li, tang 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 tan) OR (wang dan)) ((can oil) or (oman oil)) can lang li ((hong hai) or (hong yu)) ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((wang tan) OR (wang dan)) ((can oil) OR (oman oil)) can lang li ((hong hai) OR (hong yu)) ;.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((wang tan) OR (wang dan)) ((can oil) or (oman oil)) can lang li ((hong hai) or (hong yu)) ;".
• Adding a wildcard symbol may retrieve word variants: ((wang tan) OR (wang dan)) ((can oil) or (oman oil)) can lang li ((hong hai) or (hong yu)) ;*.