Perhaps you should try some spelling variations:
than coal » than modal, than cost, when coal
zhong tai » hong tan, hong hai, zhong zhi
wang ban » wang dan, wang yang, bang bang
than oil » than only, than one, than our
liang li » ling li, liang wei, liang zhi
qiang li » qiang niu, ling li, qian yi
yan » yang, ryan

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

• Performing a fuzzy search may retrieve terms with similar spellings: wang ban ((than oil) OR (than coal)) coal ((liang li) or (qiang li)) ((zhong tai) or (wang yan)) ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang ban ((than oil) OR (than coal)) coal ((liang li) OR (qiang li)) ((zhong tai) OR (wang yan)) ;.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang ban ((than oil) OR (than coal)) coal ((liang li) or (qiang li)) ((zhong tai) or (wang yan)) ;".
• Adding a wildcard symbol may retrieve word variants: wang ban ((than oil) OR (than coal)) coal ((liang li) or (qiang li)) ((zhong tai) or (wang yan)) ;*.