Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, va tinh
van hanh » van thanh, ban hanh, van anh
su tai » su thi, tu tai
tai ky » thai ky, trai ky, sai ky
va cao » va cac, va dao, va bao
x hoi » xa hoi, o hoi, x ho
va co » vo co
vu va » vu van, tu va, su va
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 tai ky nang x hoi. lieu ((va cao) or (va co)) xuc ((va thanh) or (van hanh)) vu va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su tai ky nang x hoi. lieu ((va cao) OR (va co)) xuc ((va thanh) OR (van hanh)) vu va thiet.
• Adding a wildcard symbol may retrieve word variants: su tai ky nang x hoi. lieu ((va cao) or (va co)) xuc ((va thanh) or (van hanh)) vu va thiet*.