Perhaps you should try some spelling variations:
chieu chien » thien chien, hieu hien
hieu viec » nhieu viec, hieu ve, sieu viet
van hanh » van thanh, ban hanh, van anh
sach ly » sach y, sach lo, sach ty
va hanh » va thanh, va danh, ban hanh
cac thu » cach thuc, cac thoi
su sach » so sach, vu sach
nang mo » nang meo, nang ma, nang co
ly nang » ky nang, ly hang, ly vang
cua tre » cua te, cuu tre, cua triet
mo hoc » mon hoc, co hoc
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ly nang mo hoc. ((hieu viec) or (chieu chien)) cac thu ((va hanh) or (van hanh)) vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ly nang mo hoc. ((hieu viec) OR (chieu chien)) cac thu ((va hanh) OR (van hanh)) vi cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach ly nang mo hoc. ((hieu viec) or (chieu chien)) cac thu ((va hanh) or (van hanh)) vi cua tre*.