Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien danh
cao thuong » cao truong, cho thuong, chan thuong
thien anh » thien danh, tien anh, thien thanh
than tinh » thanh tinh, than kinh, thai tinh
ca thuong » cua thuong, va thuong, cp thuong
cong dan » cong san, cong tan, huong dan
dan than » dan chan, ban than, van than
than tap » toan tap, han tap, phan tap

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 (thien anh)) - than tinh ((ca thuong) OR (cao thuong)) cong dan than tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu xanh) OR (thien anh)) - than tinh ((ca thuong) OR (cao thuong)) cong dan than tap*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu xanh) or (thien anh)) - than tinh ((ca thuong) OR (cao thuong)) cong dan than tap*".