Perhaps you should try some spelling variations:
wang yuhan » wang luhang, wang yan, wang yidan
real liang » real long, real line
wang wang » wang yang, wang liang, wang yan
yuhan oil » than oil
zhong zhi » zhang zhi, hong ghi, zhong tai
oil real » oil coal, oil rent
liang li » ling li, qiang li, liang wei
wang yue » wong yue, wang hua, wang yan

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

• Performing a fuzzy search may retrieve terms with similar spellings: wang wang yuhan oil real liang li ((zhong zhi) or (wang yue)) ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang wang yuhan oil real liang li ((zhong zhi) OR (wang yue)) ;.
• Adding a wildcard symbol may retrieve word variants: wang wang yuhan oil real liang li ((zhong zhi) or (wang yue)) ;*.