Perhaps you should try some spelling variations:
chieu ke » hieu ky, hieu ve, chinh ke
hieu kem » hieu ky, hieu ve
ve triet » va trien, su triet
so sach » so sanh, bo sach, co sach
cao hoi » cau hoi, co hoi, cao hoc
hanh tu » anh tu, danh tu
y nang » ky nang, ly nang, v nang
luc va » tuc va, loc va
tu ve » tu va, tu le, tu te

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: so sach y nang cao hoi. ((chieu ke) or (hieu kem)) cau ((luc va) OR (duc va)) hanh tu ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach y nang cao hoi. ((chieu ke) OR (hieu kem)) cau ((luc va) OR (duc va)) hanh tu ve triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach y nang cao hoi. ((chieu ke) or (hieu kem)) cau ((luc va) OR (duc va)) hanh tu ve triet".
• Adding a wildcard symbol may retrieve word variants: so sach y nang cao hoi. ((chieu ke) or (hieu kem)) cau ((luc va) OR (duc va)) hanh tu ve triet*.