Perhaps you should try some spelling variations:
hanh di » hanh vi, hanh de, hang di
sach ty » sach y, sach thu, xach tay
hieu va » lieu va, hieu qua
nang ma » tang ma, sang ma, nang cao
sach tu » sach thu, cach tu, sach uu
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, ma hoa
va cam » va cham, va cac, va cao
luc va » tuc va, loc va
di cua » dai cua, doi cua, de cua

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 ty) OR (sach tu)) nang ma hoi. hieu va cam ((luc va) OR (duc va)) hanh di cua tre~.
• Adding a wildcard symbol may retrieve word variants: te ((sach ty) or (sach tu)) nang ma hoi. hieu va cam ((luc va) or (duc va)) hanh di cua tre*.