Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
te sach » toc sach
cua tre » cuu tre, cua triet, dua tren
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
lang ha » long ha
va cam » va cham, va cac, va cao
cua te » cua tu
cam o » cham o, cam lo, ca o
o van » vo van, so van, do van

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: te sach ky ((nang xa) OR (lang ha)) hoi. hieu va cam o van hanh vi ((cua tre) OR (cua te))~.
• Adding a wildcard symbol may retrieve word variants: te sach ky ((nang xa) or (lang ha)) hoi. hieu va cam o van hanh vi ((cua tre) or (cua te))*.