Perhaps you should try some spelling variations:
trung van » truong van, trong van, trung va
lam trung » lam truong, nam trung, lam trong
sach hay » sach han, sach ha, sach nay
hieu van » hieu va, thien van, lieu va
van hanh » van thanh, ban hanh, van anh
lang xa » lang ha, dang xay, lang van
van lam » van nam
cua tre » cua te, cuu tre, cua triet
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 hay) or (sach y)) lang xa hoi. hieu van lam trung van hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach hay) OR (sach y)) lang xa hoi. hieu van lam trung van hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: su ((sach hay) or (sach y)) lang xa hoi. hieu van lam trung van hanh vi cua tre*.