Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
hanh vai » hanh vi, hanh va, hanh tai
nang mai » nang ma, lang mai, nang cai
cam thuc » am thuc, nam thuc, cam thu
nang tai » hang tai, tang tai, sang tai
vai cua » dai cua, hai cua, lai cua
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
hieu ve » hieu va, hieu van
so sach » bo sach, co sach, hoc sach
so sanh » do sanh
ve cam » ve cham, ve cac, va cam

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) OR (so sanh)) v ((nang mai) or (nang tai)) hoi. hieu ve cam thuc va hanh vai cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (so sanh)) v ((nang mai) OR (nang tai)) hoi. hieu ve cam thuc va hanh vai cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sach) OR (so sanh)) v ((nang mai) or (nang tai)) hoi. hieu ve cam thuc va hanh vai cua viet".
• Adding a wildcard symbol may retrieve word variants: ((so sach) OR (so sanh)) v ((nang mai) or (nang tai)) hoi. hieu ve cam thuc va hanh vai cua viet*.