Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
nang cai » nang cao, nang tai, nang cap
hieu van » hieu va, thien van, lieu va
hanh va » hang va, hanh vi
va hanh » van hanh, va thanh, va danh
su sach » vu sach
hieu ve » hieu va
cai hoi » cau hoi, dai hoi, cai hoa
so sach » so sanh, bo sach, co sach
xuc va » duc va, tuc va, luc va
va cua » va chua, via cua, ca 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)) ky nang cai hoi. ((hieu ve) OR (hieu van)) cam xuc va hanh va cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sach)) ky nang cai hoi. ((hieu ve) OR (hieu van)) cam xuc va hanh va cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (so sach)) ky nang cai hoi. ((hieu ve) OR (hieu van)) cam xuc va hanh va cua triet".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (so sach)) ky nang cai hoi. ((hieu ve) OR (hieu van)) cam xuc va hanh va cua triet*.