Perhaps you should try some spelling variations:
cham thuc » nham thuc, pham thuc, tham thuc
duy nhanh » duy khanh, day nhanh, duy anh
day hanh » day nhanh, day thanh, day manh
dao hanh » dao thanh, dang hanh, ban hanh
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
cau tre » cau tren, cau treo, cau tra
di cau » da cau, diem cau
x hoi » xa hoi, o hoi, x ho

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 ky nang x hoi. hieu ve cham thuc ((((day hanh) or (dao hanh))) or (duy nhanh)) di cau tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang x hoi. hieu ve cham thuc ((((day hanh) OR (dao hanh))) OR (duy nhanh)) di cau tre.
• Adding a wildcard symbol may retrieve word variants: su sach ky nang x hoi. hieu ve cham thuc ((((day hanh) or (dao hanh))) or (duy nhanh)) di cau tre*.