Perhaps you should try some spelling variations:
cam thuc » am thuc, nam thuc, cam thu
cua viet » ca viet, hoa viet, cua vat
so sach » so sanh, bo sach, co sach
mai hoi » mai khoi, lai hoi, mai doi
dai hoi » dai hoc, dai hai, dai moi
hieu ve » hieu va, hieu van
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang
ve cam » ve cham, ve cac, va cam
vi cua » vai cua, di cua

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 ((mai hoi) OR (dai hoi)). hieu ve cam thuc va hanh vi cua viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach v nang ((mai hoi) OR (dai hoi)). hieu ve cam thuc va hanh vi cua viet".
• Adding a wildcard symbol may retrieve word variants: so sach v nang ((mai hoi) OR (dai hoi)). hieu ve cam thuc va hanh vi cua viet*.