Perhaps you should try some spelling variations:
nhiem nghe » nghiep nghe, hiem ngheo
nam thuc » nam thuoc, nam thu, nam tu
vat hanh » vat thanh, van hanh, va hanh
su sach » so sach, vu sach
nang ma » tang ma, sang ma, nang cao
luu tre » luu tru, cuu tre, luy tre
ma hoi » mai hoi, xa hoi, ma hoa
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 hoi. nhiem nghe ((nam thuc) OR (am 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 hoi. nhiem nghe ((nam thuc) OR (am 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 hoi. nhiem nghe ((nam thuc) OR (am thuc)) vat hanh vi luu tre".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (thu hoach)) ky nang ma hoi. nhiem nghe ((nam thuc) OR (am thuc)) vat hanh vi luu tre*.