Perhaps you should try some spelling variations:
thanh trung » thanh tung
thieu xanh » hieu manh, thien anh, thien danh
chieu xanh » chieu sach, chieu sang, chieu tinh
dung cong » dung trong
trung ha » trung hoc, trung tam, trung cap
cong ban » cong bang, cong san, cong tan
ha dung » hai dung, kha dung, nha dung
khan ap » khan cap, khan dam
han ap » han tap, dan ap, han phap

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 (chieu xanh)) - thanh trung ha dung cong ban ((khan ap) OR (han ap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu xanh) OR (chieu xanh)) - thanh trung ha dung cong ban ((khan ap) OR (han ap))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu xanh) or (chieu xanh)) - thanh trung ha dung cong ban ((khan ap) OR (han ap))*".