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