Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
nang mai » nang tai, lang mai, nang cai
va cham » va chat, va tham
danh vi » hanh vi, dinh vi, danh di
va danh » va dinh, va dan, va hanh
thuc va » thuc vat, thuc dan, thuc day
so sach » so sanh, bo sach, co sach
nang ma » tang ma, sang ma, nang cao
vi cua » vai cua, di cua
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 y ((nang mai) or (nang ma)) hoi. hieu ((ve cam) or (va cham)) thuc va danh vi cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach y ((nang mai) OR (nang ma)) hoi. hieu ((ve cam) OR (va cham)) thuc va danh vi cua viet.
• Adding a wildcard symbol may retrieve word variants: so sach y ((nang mai) or (nang ma)) hoi. hieu ((ve cam) or (va cham)) thuc va danh vi cua viet*.