Perhaps you should try some spelling variations:
4 challenges » 3 challenges, 2 challenges
chan sang » chan kang, choi sang, chan eng
daud yang » daun yang, daud wan, du yang
wan chan » han chang, wang chau, mun chan
yi chang » ying chang, jin chang, vii chang
ii chang » vii chang, ii changes, iii change
sang m » sang _

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

• Performing a fuzzy search may retrieve terms with similar spellings: wan chan sang m daud yang ((((yi chang) OR (ii chang))) or (4 challenges)) (hai or hadi) ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wan chan sang m daud yang ((((yi chang) OR (ii chang))) OR (4 challenges)) (hai OR hadi) ;*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wan chan sang m daud yang ((((yi chang) OR (ii chang))) or (4 challenges)) (hai or hadi) ;*".