Perhaps you should try some spelling variations:
cham thuc » nham thuc, pham thuc, tham thuc
qua cham » qua hai, qua cac, va cham
nang noi » nang doc
ban hanh » ban hang
thuc ban » thuoc ban, thuc dan, thu ban
hanh di » hanh vi, hanh de, hang di
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
lang ra » lang ha, lang xa, lang va
cua tu » cua tuc, cua su, cua te
cua cu » cua chu, cua cau, cua su

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 noi) or (lang ra)) hoi. hieu qua cham thuc ban hanh di ((cua tu) or (cua cu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky ((nang noi) OR (lang ra)) hoi. hieu qua cham thuc ban hanh di ((cua tu) OR (cua cu)).
• Adding a wildcard symbol may retrieve word variants: su sach ky ((nang noi) or (lang ra)) hoi. hieu qua cham thuc ban hanh di ((cua tu) or (cua cu))*.