Perhaps you should try some spelling variations:
tranh thiet » trinh thiet, trang thiet, toan thiet
theo chieu » ho chieu, theo chu, thi chieu
thiet xung » thuat xung
xung cong » xuong cong, dung cong, luong cong
cong doan » cong dan, cong hoan, dong doanh
doan van » doan va, hoang van, luan van

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((theo chieu) or (theo tieu)) xanh - canh tranh thiet xung cong doan van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((theo chieu) OR (theo tieu)) xanh - canh tranh thiet xung cong doan van ban.
• Adding a wildcard symbol may retrieve word variants: ((theo chieu) or (theo tieu)) xanh - canh tranh thiet xung cong doan van ban*.