Perhaps you should try some spelling variations:
real liang » real long, real line
wang wang » wang yang, wang liang, wang yong
oil real » oil coal, oil rent
liang li » ling li, qiang li, liang wei
hong hai » shang hai, zhong tai, dang hai
yan oil » can oil, oman oil, than oil
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 wang yan oil real liang li ((hong hai) or (hong yu)) ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang wang yan oil real liang li ((hong hai) OR (hong yu)) ;.
• Adding a wildcard symbol may retrieve word variants: wang wang yan oil real liang li ((hong hai) or (hong yu)) ;*.