Perhaps you should try some spelling variations:
doc sach » hoc sach, toc sach, nuoc sach
ve triet » va trien, su triet
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va, hieu qua
ma hoi » mai hoi, xa hoi, ma hoa
va cam » va cham, va cac, va cao
xuc va » tuc va, luc va, xac va
cua te » cua tu

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: doc sach ky nang ma hoi. hieu va cam ((xuc va) OR (duc va)) hanh vi ((cua te) OR (ve triet))~.
• Adding a wildcard symbol may retrieve word variants: doc sach ky nang ma hoi. hieu va cam ((xuc va) or (duc va)) hanh vi ((cua te) or (ve triet))*.