Perhaps you should try some spelling variations:
cham thuc » nham thuc, pham thuc, tham thuc
ban thanh » ban hang
ban hanh » ban hang
su sach » so sach, vu sach
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
nang ma » tang ma, sang ma, nang cao
te sach » toc sach
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, ma hoa
ve cua » le cua, de cua, te cua

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 (te sach)) ky nang ma hoi. hieu ve cham thuc ((ban thanh) OR (ban hanh)) ve cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (te sach)) ky nang ma hoi. hieu ve cham thuc ((ban thanh) OR (ban hanh)) ve cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (te sach)) ky nang ma hoi. hieu ve cham thuc ((ban thanh) OR (ban hanh)) ve cua tre*".