Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
nham thuc » nhan thuc, nam thuc, nham thu
dang xay » dang van, van xay
cua tre » cua te, cuu tre, dua tren
hanh ve » hanh vi, hanh va, hanh kem
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
mang xa » lang xa, mang may, mang cua
va nham » va cham, va tham, va nha

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 ky ((mang xa) or (dang xay)) hoi. lieu va nham thuc va hanh ve ((cua tre) OR (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky ((mang xa) OR (dang xay)) hoi. lieu va nham thuc va hanh ve ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky ((mang xa) or (dang xay)) hoi. lieu va nham thuc va hanh ve ((cua tre) OR (cua triet))".
• Adding a wildcard symbol may retrieve word variants: su sach ky ((mang xa) or (dang xay)) hoi. lieu va nham thuc va hanh ve ((cua tre) OR (cua triet))*.