Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
chat thuc » thuat thuc, nhan thuc, chat huu
sach ky » sach y, sach ty, sach kem
lang xa » lang ha, dang xay, lang van
va hanh » van hanh, va thanh, va danh
sac ky » cac ky, sai ky
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 (sac ky)) lang xa hoi. hieu qua ((chat thuc) OR (chat thai)) va hanh vi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ky) OR (sac ky)) lang xa hoi. hieu qua ((chat thuc) OR (chat thai)) va hanh vi cua triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ky) or (sac ky)) lang xa hoi. hieu qua ((chat thuc) OR (chat thai)) va hanh vi cua triet*".