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
nang ma » tang ma, sang ma, nang cao
xuc van » duc van, luc van, vuc van
y nang » ky nang, ly nang, v nang
ve cam » ve cham, ve cac, va cam
va cai » va cac, va bai, va dai
va co » vo co

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang ma hoa. hieu ((((ve cam) OR (va cai))) OR (va co)) xuc van hanh dai cua vat~.
• Adding a wildcard symbol may retrieve word variants: tu sach y nang ma hoa. hieu ((((ve cam) or (va cai))) or (va co)) xuc van hanh dai cua vat*.