Perhaps you should try some spelling variations:
wang planning » range planning, land planning, kong planning
planning can » planning chain, planning case, planning land
oil front » oil from, die front
zhong tai » hong tan, hong hai, zhong zhi
line pll » line call, line plot, line plus
wong yue » wang yue, hong yu
can oil » can soils, can only, corn oil

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: wang planning can oil front line pll ((zhong tai) OR (wong yue)) ;~.
• Adding a wildcard symbol may retrieve word variants: wang planning can oil front line pll ((zhong tai) or (wong yue)) ;*.