Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
nam thuc » nam thuoc, am thuc, nam thu
hanh hoi » hanh thoi, hanh noi, hanh hoa
van hanh » van thanh, ban hanh, van anh
thuc van » thuc vat, thuc dan, thuc va
cua tre » cua te, cuu tre, dua tren
so sach » so sanh, bo sach, co sach
hieu le » hieu ve, hieu he, hieu ly
mang xa » lang xa, mang may, dang xay
sach 2 » sach y
le nam » ly nam, he nam, le na

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 2 ((mang xa) or (nang x)) hoi. hieu le nam thuc van hanh hoi ((cua tre) OR (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach 2 ((mang xa) OR (nang x)) hoi. hieu le nam thuc van hanh hoi ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach 2 ((mang xa) or (nang x)) hoi. hieu le nam thuc van hanh hoi ((cua tre) OR (cua triet))".
• Adding a wildcard symbol may retrieve word variants: so sach 2 ((mang xa) or (nang x)) hoi. hieu le nam thuc van hanh hoi ((cua tre) OR (cua triet))*.