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, qiang li, liang wei
qian yi » qian yan
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 (qian yi)) ((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 (qian yi)) ((zhong tai) OR (wang yan)) ;".
• Adding a wildcard symbol may retrieve word variants: wang ban ((than oil) OR (than coal)) coal ((liang li) OR (qian yi)) ((zhong tai) OR (wang yan)) ;*.