Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
nang tai » hang tai, tang tai, sang tai
hanh dan » thanh dan, hanh san, canh dan
sach ky » sach y, sach ty, sach kem
tai hoi » tai khoi, dai hoi, tai hai
hieu vi » hieu voi, hieu va, hieu ve
vi tham » vi pham, va tham, vi than
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
dan cua » dan ca, ban cua, dai cua
sac ky » cac ky, sai ky
cua te » cua tu

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) or (sac ky)) nang tai hoi. hieu vi tham thuc va hanh dan cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ky) OR (sac ky)) nang tai hoi. hieu vi tham thuc va hanh dan cua te.
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) or (sac ky)) nang tai hoi. hieu vi tham thuc va hanh dan cua te*.