Perhaps you should try some spelling variations:
nhiem nghe » nghiep nghe, hiem ngheo
mai khoi » tai khoa, cac khoi, dai khoa
mai khoa » tai khoa, may khoa, dai khoa
nghe nam » nghe lam, nghiep nam, nghe nano
danh dau » lanh dao, hang dau, danh tu
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
mai hoi » dai hoi, lai hoi, mai doi
ha danh » han danh, hoa danh, ha anh
dau cua » dai cua, day cua, cau cua
cua tre » cua te, cuu tre, cua triet

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 ky nang ((mai hoi) or (((mai khoi) OR (mai khoa)))). nhiem nghe nam thu ha danh dau cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ((mai hoi) OR (((mai khoi) OR (mai khoa)))). nhiem nghe nam thu ha danh dau cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang ((mai hoi) or (((mai khoi) OR (mai khoa)))). nhiem nghe nam thu ha danh dau cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ((mai hoi) or (((mai khoi) OR (mai khoa)))). nhiem nghe nam thu ha danh dau cua tre*.