Perhaps you should try some spelling variations:
hanh dai » hanh tai, hanh dao, vanh dai
van hanh » van thanh, ban hanh, van anh
sach ty » sach y, sach tu, sach thu
duc van » duc va, duc tan, duc manh
vu sach » vu bach, su sach, vu khach
nang ma » tang ma, sang ma, nang cao
ty nang » ky nang, ty xang, ty hang
ve cam » ve cham, ve cac, ve cau
ve cai » va cai, ve cac, ve tai
va cam » va cham, va cac, va cao
ma hoi » mai hoi, xa hoi, ma hoa

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: vu sach ty nang ma hoi. hieu ((((ve cam) OR (ve cai))) OR (va cam)) duc van hanh dai cua vat~.
• Adding a wildcard symbol may retrieve word variants: vu sach ty nang ma hoi. hieu ((((ve cam) or (ve cai))) or (va cam)) duc van hanh dai cua vat*.