Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
cua tre » cua te, cua triet, dua tren
dau lai » dao lai, dat lai, dau hai
sach ky » sac ky, sach y, sach ty
cac tuc » cac toc, cac tu, cac tac
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va, hieu van
cuu tre » cau tren, cau treo
tuc va » thuc va, truc va, tuc xa
va dau » va dao
ma hoi » mai hoi, xa hoi, ma hoa

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