Perhaps you should try some spelling variations:
trinh cong » trinh dung
thieu xanh » chieu xanh, hieu manh, thien danh
cong tuong » cong thuong, cong truong, cong trong
duong cong » dung cong, luong cong, duong trong
thien anh » thien danh, tien anh, thien thanh
cong bai » cuong bai, cong hai, cung bai
bai van » bui van, hai van, mai van

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)) - trinh cong tuong duong cong bai van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu xanh) OR (thien anh)) - trinh cong tuong duong cong bai van ban.
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu xanh) or (thien anh)) - trinh cong tuong duong cong bai van ban*.