Perhaps you should try some spelling variations:
nghe nam » nghe lam, nghiep nam, nghe nano
sai cua » dai cua, hai cua, lai cua
dan sai » danh sai, doan sai, dan tai
nam dan » nam dinh
thu nam » tu nam, thu nhap, thu nhat
sach ky » sach y, sach ty, sach kem
nang ma » tang ma, sang ma, nang cao
cua tre » cua te, cuu tre, cua triet
he nam » ha nam
ma hoi » mai hoi, xa hoi, ma hoa
sac ky » cac ky, sai ky

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) OR (sac ky)) nang ma hoi. hieu ((he nam) OR (nghe nam)) thu nam dan sai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) OR (sac ky)) nang ma hoi. hieu ((he nam) or (nghe nam)) thu nam dan sai cua tre~".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) OR (sac ky)) nang ma hoi. hieu ((he nam) or (nghe nam)) thu nam dan sai cua tre*.