Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
sach van » sach han, sach va, bach van
van hanh » van thanh, ban hanh, van anh
thuc van » thuc vat, thuc dan, thuc va
cua tre » cua te, cuu tre, dua tren
hanh te » hanh tu, hanh ve, hanh de
so sach » so sanh, bo sach, co sach
ve nam » va nam, le nam, te nam
co hoi » co hoc, co loi
ban co » ban do, san co
he nam » ha nam, nghe nam

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

• If you are trying to use Boolean operators, they must be ALL CAPS: so sach van ban co hoi. hieu ((ve nam) OR (he nam)) thuc van hanh te ((cua tre) OR (cua triet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach van ban co hoi. hieu ((ve nam) or (he nam)) thuc van hanh te ((cua tre) OR (cua triet))~".
• Adding a wildcard symbol may retrieve word variants: so sach van ban co hoi. hieu ((ve nam) or (he nam)) thuc van hanh te ((cua tre) OR (cua triet))*.