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