Perhaps you should try some spelling variations:
nhiem nghe » nghiep nghe, hiem ngheo
nghe nam » nghe lam, nghiep nam, nghe nano
nam thuc » nam thuoc, am thuc, nam thu
vat hanh » vat thanh, van hanh, va hanh
su sach » so sach, vu sach
nang ma » sang ma, nang cao, mang may
tang ma » mang may, tang van
luu tre » luu tru, cuu tre, luy tre
vi luu » vi lua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) or (thu hoach)) ky ((nang ma) OR (tang ma)) hoi. nhiem nghe nam thuc vat hanh vi luu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (thu hoach)) ky ((nang ma) OR (tang ma)) hoi. nhiem nghe nam thuc vat hanh vi luu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (thu hoach)) ky ((nang ma) OR (tang ma)) hoi. nhiem nghe nam thuc vat hanh vi luu tre".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (thu hoach)) ky ((nang ma) OR (tang ma)) hoi. nhiem nghe nam thuc vat hanh vi luu tre*.