Perhaps you should try some spelling variations:
cham thuc » nham thuc, pham thuc, tham thuc
mai khoi » mai khoa, tai khoa, cac khoi
sang mai » sang ma, sang tai, lang mai
hoc vien » hoc hien, hoc viet, hoc tieng
sach ty » sach tu, sach thu, xach tay
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
hanh va » hang va, hanh vi
va hoc » van hoc

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

• Performing a fuzzy search may retrieve terms with similar spellings: bo ((sach ty) or (sach y)) sang mai khoi. hieu ve cham thuc va hanh va hoc vien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: bo ((sach ty) OR (sach y)) sang mai khoi. hieu ve cham thuc va hanh va hoc vien.
• Adding a wildcard symbol may retrieve word variants: bo ((sach ty) or (sach y)) sang mai khoi. hieu ve cham thuc va hanh va hoc vien*.