Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
hanh dai » hanh tai, hanh dao, vanh dai
ky sang » ky nang, ky dang, ky tang
sang ma » tang ma, nang ma, sang tao
luc van » luoc van, luu van, duc van
vu sac » vu sach, vu san, va sac
sac ky » cac ky, sai ky
ma hoi » mai hoi, xa hoi, ma hoa
va cam » va cham, va cao, va cai

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sac ky sang ma hoi. hieu ((va cam) or (va cac)) luc van hanh dai cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sac ky sang ma hoi. hieu ((va cam) OR (va cac)) luc van hanh dai cua vat*.