Perhaps you should try some spelling variations:
vu khach » vu khanh, vu khac, vay khach
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
hieu van » hieu va, thien van, lieu va
vu sach » vu bach
hanh di » hanh vi, hanh de, hang di
va hanh » van hanh, va thanh, va danh
van cac » van hac, van cau, van bac
cua tre » cua te, cuu tre, cua triet
nang ma » tang ma, sang ma, nang cao
su sach » so sach
di cua » dai cua, doi cua, de cua
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) OR (vu khach))) OR (su sach)) ky nang ma hoi. hieu van cac nuoc va hanh di cua tre~.
• Adding a wildcard symbol may retrieve word variants: ((((vu sach) or (vu khach))) or (su sach)) ky nang ma hoi. hieu van cac nuoc va hanh di cua tre*.