Perhaps you should try some spelling variations:
hanh dai » hanh tai, hanh dao, vanh dai
su cach » su sach, tu cach, cuu cach
va hanh » van hanh, va thanh, va danh
le tang » le quang, le trung, le thanh
tang xa » trang xa, tang ma, lang xa
va cao » va cac, va co, va dao
suc va » duc va, tuc va, luc va
dai va » mai va
su cac » tu cac, su cao, su can
ve co » vo co, va co, de co
thiet » thieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su cach) or (su cac)) le tang xa hoi. hieu ((ve co) or (va cao)) suc va hanh dai va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su cach) OR (su cac)) le tang xa hoi. hieu ((ve co) OR (va cao)) suc va hanh dai va thiet.
• Adding a wildcard symbol may retrieve word variants: ((su cach) or (su cac)) le tang xa hoi. hieu ((ve co) or (va cao)) suc va hanh dai va thiet*.