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