Perhaps you should try some spelling variations:
cua triet » cua viet, su triet
thanh dai » thanh hai, thanh tai, thanh dat
van thanh » ban thanh, van tuan
va triet » va thiet, va trien, ve triet
nam thuc » nam thuoc, am thuc, nam thu
thuc van » thuc vat, thuc dan, thuc va
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
nang ma » tang ma, sang ma, nang cao
mang xa » lang xa, mang may, dang xay
ve nam » he nam, va nam, le 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: su sach y ((mang xa) OR (nang ma)) hoi. hieu ve nam thuc van thanh dai ((cua triet) OR (va triet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y ((mang xa) or (nang ma)) hoi. hieu ve nam thuc van thanh dai ((cua triet) OR (va triet))~".
• Adding a wildcard symbol may retrieve word variants: su sach y ((mang xa) or (nang ma)) hoi. hieu ve nam thuc van thanh dai ((cua triet) OR (va triet))*.