Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
chieu ke » hieu ky, hieu ve, chinh ke
hieu kem » hieu ky, hieu ve
hanh vu » hanh vi, hanh va, hanh tu
va hanh » van hanh, va thanh, va danh
truc va » thuc va, thuc vat, trung va
so sach » so sanh, co sach, hoc sach
cao hoi » cau hoi, co hoi, cao hoc
ly nang » ky nang, ly hang, ly vang
bo sach » co sach, hoc sach
vu va » vu van, tu va, su va

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) OR (bo sach)) ly nang cao hoi. ((chieu ke) or (hieu kem)) cau truc va hanh vu va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (bo sach)) ly nang cao hoi. ((chieu ke) OR (hieu kem)) cau truc va hanh vu va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sach) OR (bo sach)) ly nang cao hoi. ((chieu ke) or (hieu kem)) cau truc va hanh vu va triet".
• Adding a wildcard symbol may retrieve word variants: ((so sach) OR (bo sach)) ly nang cao hoi. ((chieu ke) or (hieu kem)) cau truc va hanh vu va triet*.