Perhaps you should try some spelling variations:
tren dich » trien dich, tren dinh, trinh dich
hieu tren » hieu truyen, hieu tieng, hieu triet
dich ngoc » dinh ngoc, bich ngoc, dich nuoc
bo sach » co sach, hoc sach
sach ty » sach y, sach tu, sach thu
xang xa » mang xa, ang xa, dang xay
lang xa » lang ha, dang xay, lang van
ngoc va » nuoc va, ngoc ha, goc va
va hanh » van hanh, va thanh, va danh
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: bo sach ty ((xang xa) or (lang xa)) hoi. hieu tren dich ngoc va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: bo sach ty ((xang xa) OR (lang xa)) hoi. hieu tren dich ngoc va hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: bo sach ty ((xang xa) or (lang xa)) hoi. hieu tren dich ngoc va hanh vi cua tre*.