Perhaps you should try some spelling variations:
cham thuc » nham thuc, pham thuc, tham thuc
ban thanh » ban hanh, ban hang
hieu van » hieu va, thien van, lieu va
thanh vi » hanh vi, thanh va, thanh ve
toc sach » hoc sach, doc sach, thuoc sach
thuc ban » thuoc ban, thuc dan, thu ban
su sach » so sach, vu sach
cuu tre » cua tre, cau tren, cau treo
hieu ve » hieu va
nang ma » tang ma, sang ma, nang cao
ma hoi » mai hoi, xa hoi, ma hoa
vi cuu » vi luu, vinh cuu

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (toc sach)) ky nang ma hoi. ((hieu ve) OR (hieu van)) cham thuc ban thanh vi cuu tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (toc sach)) ky nang ma hoi. ((hieu ve) OR (hieu van)) cham thuc ban thanh vi cuu tre~".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (toc sach)) ky nang ma hoi. ((hieu ve) OR (hieu van)) cham thuc ban thanh vi cuu tre*.