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
hoc sach » hoc sinh, hoc cac, hoc anh
ty lang » tay lang, ty hang, tu lang
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: hoc sach ((ty lang) or (ty xang)) xa hoi. hieu tren dich ngoc va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ((ty lang) OR (ty xang)) xa hoi. hieu tren dich ngoc va hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: hoc sach ((ty lang) or (ty xang)) xa hoi. hieu tren dich ngoc va hanh vi cua tre*.