Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
dua tren » dung tren
sach sy » sach y, sach ty, sach hay
dinh vi » dinh ve, dinh viet, dinh tri
va dinh » van dinh, va kinh, va tinh
thuc va » thuc vat, thuc dan, thuc day
su sach » so sach, vu sach
ve cham » va cham, ve chat, vu cham
long ha » dong ha, cong ha, dong hoa
sy long » sy luong, quy long
va cam » va cham, va cac, va cao
ha hoi » hoa hoi, ha noi, xa hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach sy long ha hoi. hieu ((ve cham) or (va cam)) thuc va dinh vi ((dua tren) or (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach sy long ha hoi. hieu ((ve cham) OR (va cam)) thuc va dinh vi ((dua tren) OR (cua viet)).
• Adding a wildcard symbol may retrieve word variants: su sach sy long ha hoi. hieu ((ve cham) or (va cam)) thuc va dinh vi ((dua tren) or (cua viet))*.