Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
nam thuc » nam thuoc, nam thu, nam tu
thanh vi » hanh vi, thanh va, thanh ve
tu sach » thu sach, su sach, te sach
hieu he » hieu ve, hiem he, hieu le
vi luu » vi lua
x hoi » xa hoi, o hoi, x ho
tru* » truc*

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) or (thu hoach)) ky nang x hoi. hieu he ((nam thuc) OR (am thuc)) ban thanh vi luu tru~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu hoach)) ky nang x hoi. hieu he ((nam thuc) OR (am thuc)) ban thanh vi luu tru*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thu hoach)) ky nang x hoi. hieu he ((nam thuc) OR (am thuc)) ban thanh vi luu tru*".