Perhaps you should try some spelling variations:
cdieu hanh » chieu xanh, deu hanh, dieu danh
vien nganh » vien thanh
tranh qua » tranh cua, thanh qua, trinh qua
dung cong » dung trong
qua dung » quang dung, su dung, qua song
cong tap » cuong tap, cong tac, cong tan
tap toan » tap doan, tap quan, bai toan
toan ban » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc ((((dieu hanh) or (cdieu hanh))) or (vien nganh)) - canh tranh qua dung cong tap toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((((dieu hanh) OR (cdieu hanh))) OR (vien nganh)) - canh tranh qua dung cong tap toan ban.
• Adding a wildcard symbol may retrieve word variants: doc ((((dieu hanh) or (cdieu hanh))) or (vien nganh)) - canh tranh qua dung cong tap toan ban*.