Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
vat hanh » vat thanh, van hanh, va hanh
sach ty » sach y, sach tu, xach tay
mang xa » lang xa, mang may, dang xay
thi van » thi lan, thi hanh, thi nang
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: tu ((sach ty) OR (sach thu)) mang xa hoi. ((thien van) or (thi van)) nam cua vat hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ty) OR (sach thu)) mang xa hoi. ((thien van) OR (thi van)) nam cua vat hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ty) OR (sach thu)) mang xa hoi. ((thien van) or (thi van)) nam cua vat hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) OR (sach thu)) mang xa hoi. ((thien van) or (thi van)) nam cua vat hanh vi cua tre*.