Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
hieu van » hieu va, thien van, lieu va
lam thuc » lam thuoc, am thuc, nam thuc
ky danh » ky anh
ky dang » ky nang
van lam » van nam
thuc va » thuc vat, thuc dan, thuc day
va dinh » van dinh, va kinh, va tinh
dinh va » dinh van, dinh ve, tinh va
cua tre » cua te, cuu tre, cua triet
te sach » toc sach

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ((ky dang) OR (ky danh)) ha noi. hieu van lam thuc va dinh va ((cua tre) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((ky dang) OR (ky danh)) ha noi. hieu van lam thuc va dinh va ((cua tre) OR (su triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((ky dang) OR (ky danh)) ha noi. hieu van lam thuc va dinh va ((cua tre) or (su triet))".
• Adding a wildcard symbol may retrieve word variants: te sach ((ky dang) OR (ky danh)) ha noi. hieu van lam thuc va dinh va ((cua tre) or (su triet))*.