Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
thuc day » thuc dan, thuc vat
danh dai » danh dau, danh di, danh sai
hieu van » hieu va, thien van, lieu va
van pham » san pham, van phan, van phat
cua tre » cua te, cua triet, dua tren
cuu tre » cau tren, cau treo
sach ty » sach y, sach tu, sach thu
thuc va » thuc vat, thuc dan
lang xa » lang ha, dang xay, lang van
ty lang » tay lang, ty xang, ty hang

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

• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ty lang xa hoi. hieu van pham ((thuc va) OR (thuc day)) danh dai ((cua tre) OR (cuu tre))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach ty lang xa hoi. hieu van pham ((thuc va) or (thuc day)) danh dai ((cua tre) OR (cuu tre))~".
• Adding a wildcard symbol may retrieve word variants: hoc sach ty lang xa hoi. hieu van pham ((thuc va) or (thuc day)) danh dai ((cua tre) OR (cuu tre))*.