Perhaps you should try some spelling variations:
cua triet » cua viet, su triet
va triet » va thiet, va trien, ve triet
hang cau » hang dau, hang ca, nhung cau
hieu van » thien van, lieu va, hieu ve
va hanh » van hanh, va thanh, va danh
hanh de » hanh ve, hanh kem
so sanh » do sanh
sanh ly » sinh ly, doanh ly, khanh ly
hieu va » lieu va, hieu qua
ly hang » ly quang
thu va » thuc va, thue va, 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 sanh ly hang cau hoi. ((hieu van) or (hieu va)) nam thu va hanh de ((cua triet) OR (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sanh ly hang cau hoi. ((hieu van) OR (hieu va)) nam thu va hanh de ((cua triet) OR (va triet))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sanh ly hang cau hoi. ((hieu van) or (hieu va)) nam thu va hanh de ((cua triet) OR (va triet))*".