Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu quan » lieu quan, thien quan, lien quan
hang cau » hang dau, hang ca, nhung cau
so sach » so sanh, bo sach, co sach
ly hang » ly quang
nam luc » nang luc, nhan luc, nam thuc
va hanh » van hanh, va thanh, va danh
su sach » vu sach
luc va » duc va, tuc va, loc va
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) OR (so sach)) ly hang cau hoi. ((hieu quan) or (hieu qua)) nam luc va hanh vi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sach)) ly hang cau hoi. ((hieu quan) OR (hieu qua)) nam luc va hanh vi cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (so sach)) ly hang cau hoi. ((hieu quan) or (hieu qua)) nam luc va hanh vi cua triet".
• Adding a wildcard symbol may retrieve word variants: ((su sach) OR (so sach)) ly hang cau hoi. ((hieu quan) or (hieu qua)) nam luc va hanh vi cua triet*.