Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
hanh dai » hanh tai, hanh dao, vanh dai
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
xuc van » duc van, luc van, xuc ban
ma hoi » mai hoi, xa hoi, ma hoa
ve cam » ve cham, ve cac, ve cai
va cam » va cham, va cac, va cai
va cao » va cac, va co, va dao

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky nang ma hoi. hieu ((((ve cam) or (va cam))) or (va cao)) xuc van hanh dai cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ma hoi. hieu ((((ve cam) OR (va cam))) OR (va cao)) xuc van hanh dai cua vat.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ma hoi. hieu ((((ve cam) or (va cam))) or (va cao)) xuc van hanh dai cua vat*.