Perhaps you should try some spelling variations:
chieu xanh » chieu sach, chieu sang, chieu tinh
hieu manh » hieu nganh, dieu hanh, hien hanh
hanh luan » khanh luan, hang luan, hanh luat
hoan cong » hoang cong, hoa cong, doan cuong
toan cong » tran cong, toan thong, doan cuong
dan toan » van toan, dan than, manh toan
toan tap » toan ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hieu manh) or (chieu xanh)) - hanh luan van ((hoan cong) OR (toan cong)) dan toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu manh) OR (chieu xanh)) - hanh luan van ((hoan cong) OR (toan cong)) dan toan tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hieu manh) or (chieu xanh)) - hanh luan van ((hoan cong) OR (toan cong)) dan toan tap".
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu manh) or (chieu xanh)) - hanh luan van ((hoan cong) OR (toan cong)) dan toan tap*.