Perhaps you should try some spelling variations:
hanh thai » nhanh thai, hinh thai, hanh tai
hieu van » hieu va, thien van, lieu va
thai cua » than cua, tai cuc, tri cua
van hanh » van thanh, ban hanh, van anh
duc van » duc va, duc tan, duc manh
cam duc » cam xuc, cao duc, pham duc
van cam » van nam, van lam, van cau
sach ky » sac ky, sach kem, sach hay
nang co » nang cao, nang doc, nang noi
sach ty » sach tu, sach thu, xach tay
cua tre » cua te, cuu tre, cua triet

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 ky) OR (sach ty))) OR (sach y)) nang co hoc. hieu van cam duc van hanh thai cua tre~.
• Adding a wildcard symbol may retrieve word variants: tu ((((sach ky) or (sach ty))) or (sach y)) nang co hoc. hieu van cam duc van hanh thai cua tre*.