Perhaps you should try some spelling variations:
nghe nam » nghe lam, nghiep nam, nghe nano
tu sach » thu sach, su sach, te sach
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
tang ma » mang may, tang van
nang ma » sang ma, nang cao, mang may
cua tre » cua te, cuu tre, cua triet
he nam » ha nam

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach y ((nang ma) OR (tang ma)) hoi. hieu ((he nam) or (nghe nam)) thu nam dan sai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y ((nang ma) OR (tang 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 y ((nang ma) OR (tang ma)) hoi. hieu ((he nam) or (nghe nam)) thu nam dan sai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach y ((nang ma) OR (tang ma)) hoi. hieu ((he nam) or (nghe nam)) thu nam dan sai cua tre*.