Perhaps you should try some spelling variations:
can plans » can plant, cas plans, care plans
plans oil » plant oil, plant oils, plam oil
yan yang » yang yang, yao yang, dan yang
yang oil » yang zili, yang di, yang xi
hong hai » shang hai, zhong tai, dang hai
oil can » oil cake, oil chad, oil coal
hong yu » wong yue
wang » wing, wan, lang

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

• Performing a fuzzy search may retrieve terms with similar spellings: wang yan yang oil can plans oil ((hong hai) or (hong yu)) ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang yan yang oil can plans oil ((hong hai) OR (hong yu)) ;.
• Adding a wildcard symbol may retrieve word variants: wang yan yang oil can plans oil ((hong hai) or (hong yu)) ;*.