Perhaps you should try some spelling variations:
coal line » coal mine, coal mines, goal link
lang yan » wang yan, wang yang, zhang yan
oil coal » oil cost, oil oil, oil can
hong hai » shang hai, zhong tai, dang hai
wong yue » hong yu
wang yue » wang hua, wang yan, wang he
yan can » yan clan, man can, yan cong
can oil » can soils, can only, corn oil
line li » line hi, line log, line pll

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

• If you are trying to use Boolean operators, they must be ALL CAPS: lang yan can oil coal line li ((hong hai) OR (((wong yue) OR (wang yue)))) ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "lang yan can oil coal line li ((hong hai) or (((wong yue) OR (wang yue)))) ;~".
• Adding a wildcard symbol may retrieve word variants: lang yan can oil coal line li ((hong hai) or (((wong yue) OR (wang yue)))) ;*.