Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
dinh duc » minh duc, ninh duc, tinh duc
cau tren » cu tren, dau tren, ca tren
hieu va » lieu va, hieu qua
sach ky » sac ky, sach y, sach ty
cuu tre » cua tre, cau treo
va cam » va cham, va cac, va cao
luc va » duc va, tuc va
loc va » hoc va
x hoi » xa hoi, o hoi, x ho

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 nang x hoi. hieu va cam ((luc va) or (loc va)) dinh duc ((cuu tre) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ky nang x hoi. hieu va cam ((luc va) OR (loc va)) dinh duc ((cuu tre) OR (cau tren)).
• Adding a wildcard symbol may retrieve word variants: hoc sach ky nang x hoi. hieu va cam ((luc va) or (loc va)) dinh duc ((cuu tre) or (cau tren))*.