Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
cham thuc » nham thuc, pham thuc, pham thuoc
han danh » van danh, phan dang, nhan dang
dan danh » van danh, ban danh, dai danh
te sach » toc sach
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
nang ma » tang ma, sang ma, nang cao
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) OR (tham thuc)) ((dan danh) or (han danh)) 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) OR (tham thuc)) ((dan danh) OR (han danh)) dai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang ma hoi. hieu ve ((cham thuc) OR (tham thuc)) ((dan danh) or (han danh)) dai cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang ma hoi. hieu ve ((cham thuc) OR (tham thuc)) ((dan danh) or (han danh)) dai cua tre*.