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