Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh ve » hanh ve, thanh va, thanh vien
cao hoi » cau hoi, co hoi, cao hoc
hieu he » hieu ve, hiem he, hieu le
thu ban » thu hang
cua tre » cua te, cuu tre, cua triet
cai ky » cao ky, cac ky, sai ky
sac ky » cac ky, sai ky
cam ky » cao ky, cac ky
he nam » ha nam, nghe nam
ve cua » le cua, de cua, te 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: tu ((((cai ky) OR (sac ky))) OR (cam ky)) nang cao hoi. hieu he nam thu ban thanh ve cua tre~.
• Adding a wildcard symbol may retrieve word variants: tu ((((cai ky) or (sac ky))) or (cam ky)) nang cao hoi. hieu he nam thu ban thanh ve cua tre*.