Perhaps you should try some spelling variations:
crises how » crisis how
u.s debate » u.s senate, 2.1 debate, 3.4 debate
un debate » _ debate, a debate, el debate
wang fan » wang yan, yang fan, wang ban
fan ying » fan xing, ran ying, tan ying
un debat » le debat, du debat
how race » how space

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

• Performing a fuzzy search may retrieve terms with similar spellings: wang fan ying ((((un debate) OR (un debat))) or (u.s debate)) during crises how race ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang fan ying ((((un debate) OR (un debat))) OR (u.s debate)) during crises how race ;*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang fan ying ((((un debate) OR (un debat))) or (u.s debate)) during crises how race ;*".