Perhaps you should try some spelling variations:
un debate » un debat, u.s debate, _ debate
how scale » how stable, new scale, how safe
how space » how race
how small » how smart
yan ying » fan ying, ran ying, tan ying
ying un » ding und, tying up, ying jin
wang » wing, wan, lang

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

• Performing a fuzzy search may retrieve terms with similar spellings: wang yan ying un debate during crises ((((how scale) OR (how space))) or (how small)) ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang yan ying un debate during crises ((((how scale) OR (how space))) OR (how small)) ;.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang yan ying un debate during crises ((((how scale) OR (how space))) or (how small)) ;".
• Adding a wildcard symbol may retrieve word variants: wang yan ying un debate during crises ((((how scale) OR (how space))) or (how small)) ;*.