Perhaps you should try some spelling variations:
chieu xanh » chieu sach, chieu sang, chieu tinh
van phuong » van phong, van chuong, van phung
thien anh » thien danh, tien anh, thien thanh
va phuong » va thuong, cac phuong
cong dan » cong san, cong tan, huong dan
dan khan » dan khanh, dan chan, dan than
khan cap » khan ap, than cap, khoan cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((chieu xanh) or (thien anh)) - canh tranh ((van phuong) OR (va phuong)) cong dan khan cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu xanh) OR (thien anh)) - canh tranh ((van phuong) OR (va phuong)) cong dan khan cap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu xanh) or (thien anh)) - canh tranh ((van phuong) OR (va phuong)) cong dan khan cap".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu xanh) or (thien anh)) - canh tranh ((van phuong) OR (va phuong)) cong dan khan cap*.