Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
van hoe » van hoa, van hieu, van hien
van hoc » van hoa
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
vai cua » dai cua, hai cua, lai cua
su xac » pu xac, su cac
xac ky » cac ky, sac ky, bac ky
va nam » van nam, ha nam, va nay
vi 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 xac ky nang ((van hoe) OR (van hoc)). lieu va nam thuc va hanh ((vi cua) or (vai cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su xac ky nang ((van hoe) OR (van hoc)). lieu va nam thuc va hanh ((vi cua) OR (vai cua)) triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su xac ky nang ((van hoe) OR (van hoc)). lieu va nam thuc va hanh ((vi cua) or (vai cua)) triet*".