Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
sach ky » sac ky, sach y, sach ty
cua tre » cua te, cua triet, dua tren
dung co » dung cho, dung cong, dung cua
va dung » van dung, va duong, vat dung
cac tuc » cac toc, cac tu, cac tac
hieu va » lieu va, hieu qua
hieu ve » hieu van
nang xa » nang x, lang xa, nang ma
cuu tre » cau tren, cau treo
tuc va » thuc va, truc va, tuc xa

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 ky nang xa hoi. ((hieu ve) OR (hieu va)) cac tuc va dung co ((cua tre) OR (cuu tre))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach ky nang xa hoi. ((hieu ve) OR (hieu va)) cac tuc va dung co ((cua tre) or (cuu tre))~".
• Adding a wildcard symbol may retrieve word variants: hoc sach ky nang xa hoi. ((hieu ve) OR (hieu va)) cac tuc va dung co ((cua tre) or (cuu tre))*.