Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
hieu van » hieu va, thien van, lieu va
cau tren » cu tren, dau tren, ca tren
sach ky » sac ky, sach y, sach ty
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va
cuu tre » cua tre, cau treo
xuc va » duc va, tuc va, luc va

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 ky lang xa hoi. ((hieu ve) or (hieu van)) cam xuc va van de ((cuu tre) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ky lang xa hoi. ((hieu ve) OR (hieu van)) cam xuc va van de ((cuu tre) OR (cau tren)).
• Adding a wildcard symbol may retrieve word variants: hoc sach ky lang xa hoi. ((hieu ve) or (hieu van)) cam xuc va van de ((cuu tre) or (cau tren))*.