Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
mai khoi » tai khoa, cac khoi, dai khoa
hanh hai » thanh hai, nhanh hai, hang hai
cam thuc » am thuc, nam thuc, cam thu
mai khoa » tai khoa, may khoa, dai khoa
mai doi » moi doi, mai hoi, mai duoc
hieu ve » hieu va, hieu van
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
hai cua » thai cua, dai cua, hoi cua
so sach » so sanh, bo sach, co sach
sach v » sach va, sach y, sach 2
ve cam » ve cham, ve cac, va cam
v nang » va nang, vu nang, van 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 ((mai doi) or (((mai khoi) or (mai khoa)))). hieu ve cam thuc va hanh hai cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach v nang ((mai doi) OR (((mai khoi) OR (mai khoa)))). hieu ve cam thuc va hanh hai cua viet.
• Adding a wildcard symbol may retrieve word variants: so sach v nang ((mai doi) or (((mai khoi) or (mai khoa)))). hieu ve cam thuc va hanh hai cua viet*.