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