Perhaps you should try some spelling variations:
hieu kem » hieu ky, hieu ve
chieu ke » hieu ky, hieu ve, chinh ke
va hanh » van hanh, va thanh, va danh
truc va » thuc va, thuc vat, trung va
sach ly » sach y, sach lo, sach ty
so sach » so sanh, bo sach, co sach
cao hoi » cau hoi, co hoi, cao hoc
ly nang » ky nang, ly hang, ly vang
vu va » vu van, tu va
su va » su van, tu 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 ly nang cao hoi. ((chieu ke) or (hieu kem)) cau truc va hanh ((vu va) OR (su va)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ly nang cao hoi. ((chieu ke) OR (hieu kem)) cau truc va hanh ((vu va) OR (su va)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ly nang cao hoi. ((chieu ke) or (hieu kem)) cau truc va hanh ((vu va) OR (su va)) triet".
• Adding a wildcard symbol may retrieve word variants: so sach ly nang cao hoi. ((chieu ke) or (hieu kem)) cau truc va hanh ((vu va) OR (su va)) triet*.