Perhaps you should try some spelling variations:
canh trinh » canh tranh, hanh trinh, canh tinh
tieu hanh » dieu hanh, tiem hanh, tien hanh
trinh van » trinh han, trinh quan, trinh toan
dung cong » dung trong
van dung » van dong, xay dung, tin dung
doan van » doan va, hoang van, luan van
dan van » dang van, dao van, tan 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 tieu hanh - canh trinh van dung cong ((dan van) or (doan van)) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo tieu hanh - canh trinh van dung cong ((dan van) OR (doan van)) ban*.