Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
dua tren » dung tren
dan dinh » dang dinh, doan dinh, van dinh
thuc dan » thuc hanh, hoc dan, thuc vat
sach sy » sach y, sach ty, sach hay
dinh vi » dinh ve, dinh viet, dinh tri
so sach » so sanh, bo sach, co 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: so sach sy long ha hoi. hieu ((ve cham) or (va cam)) thuc dan dinh vi ((dua tren) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach sy long ha hoi. hieu ((ve cham) OR (va cam)) thuc dan dinh vi ((dua tren) OR (cua triet)).
• Adding a wildcard symbol may retrieve word variants: so sach sy long ha hoi. hieu ((ve cham) or (va cam)) thuc dan dinh vi ((dua tren) or (cua triet))*.