Perhaps you should try some spelling variations:
phan dang » phan dau, phan cong, nhan dan
cham thuc » nham thuc, pham thuc, tham thuc
dan danh » van danh, han danh, ban danh
te sach » toc sach
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky nang ma hoi. hieu ve cham thuc ((dan danh) or (phan dang)) dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang ma hoi. hieu ve cham thuc ((dan danh) OR (phan dang)) dai cua tre.
• Adding a wildcard symbol may retrieve word variants: te sach ky nang ma hoi. hieu ve cham thuc ((dan danh) or (phan dang)) dai cua tre*.