Perhaps you should try some spelling variations:
mai khoi » mai khoa, tai khoa, cac khoi
cam thuc » am thuc, nam thuc, cam thu
hieu van » hieu va, thien van, lieu va
vu nang » vuc nang, va nang, vu dang
van cam » van nam, van lam, van cau
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
vai cua » hai cua, lai cua, bai cua
so sach » so sanh, bo sach, co sach
v nang » va nang, van nang, voi nang

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ((v nang) or (vu nang)) mai khoi. hieu van cam thuc va hanh ((vai cua) or (dai cua)) viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ((v nang) OR (vu nang)) mai khoi. hieu van cam thuc va hanh ((vai cua) OR (dai cua)) viet.
• Adding a wildcard symbol may retrieve word variants: so sach ((v nang) or (vu nang)) mai khoi. hieu van cam thuc va hanh ((vai cua) or (dai cua)) viet*.