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