Perhaps you should try some spelling variations:
nam truc » nam truoc, nam thuc, nam trung
tu sach » thu sach, su sach, tu cach
te sach » toc sach
nang ho » nang hoc, nang co, tang ho
truc va » thuc va, thuc vat, trung va
va hanh » van hanh, va thanh, va danh
vai cua » dai cua, hai cua, lai cua
y nang » ky nang, ly nang, v nang
ho hai » hoc hai, pho hai, cho hai
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: ((tu sach) or (te sach)) y nang ho hai. lieu va nam truc va hanh ((vi cua) OR (vai cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) y nang ho hai. lieu va nam truc va hanh ((vi cua) OR (vai cua)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (te sach)) y nang ho hai. lieu va nam truc va hanh ((vi cua) OR (vai cua)) triet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (te sach)) y nang ho hai. lieu va nam truc va hanh ((vi cua) OR (vai cua)) triet*.