Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, thien anh, thien danh
hang huong » hang thuong, hang luong, hoang phuong
hieu manh » chieu xanh, hieu nganh, dieu hanh
tang luan » dung luan
luan hang » luan nang, luan han, luan hung
anh tang » anh bang, anh dang, anh nang
toan cao » toan tap
toan ban » van 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 ((thieu xanh) OR (hieu manh)) - anh tang luan hang huong dan ((toan cao) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu xanh) OR (hieu manh)) - anh tang luan hang huong dan ((toan cao) OR (toan ban)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu xanh) OR (hieu manh)) - anh tang luan hang huong dan ((toan cao) or (toan ban))".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu xanh) OR (hieu manh)) - anh tang luan hang huong dan ((toan cao) or (toan ban))*.