Perhaps you should try some spelling variations:
social trend » social trends, societal trends, social stress
wang wang » wang yang, wang liang, wang yan
oil trend » oil rent
zhong tai » hong tan, hong hai, zhong zhi
wang can » wang yan, wang ban, wang dan
wong yue » wang yue, hong yu
lang li » liang li, ling li, tang li

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

• Performing a fuzzy search may retrieve terms with similar spellings: wang wang can ((oil trend) OR (social trend)) lang li ((zhong tai) or (wong yue)) ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang wang can ((oil trend) OR (social trend)) lang li ((zhong tai) OR (wong yue)) ;*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang wang can ((oil trend) OR (social trend)) lang li ((zhong tai) or (wong yue)) ;*".