Perhaps you should try some spelling variations:
thien van » thi van
cua triet » cua viet, su triet, va triet
nong van » song van, nong dan, nong san
lang van » dang van, tang van, hoang van
nam thuc » nam thuoc, am thuc, nam thu
sach ky » sac ky, sach ty, sach kem
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
vi cua » vai cua, di cua

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) OR (sach y)) ((nong van) or (lang van)) hoi. thien van nam thuc va hanh vi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ky) OR (sach y)) ((nong van) OR (lang van)) hoi. thien van nam thuc va hanh vi cua triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ky) OR (sach y)) ((nong van) or (lang van)) hoi. thien van nam thuc va hanh vi cua triet*".