Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
cong khanh » cong thanh, cong khan, cong nhan
doi chieu » doc hieu, doi chi, ho chieu
luat dung » suat dung, luat chung, luat quang
cong hach » cong sach, cong thanh, trong hach
doi hieu » doc hieu, doi hien, hoi hieu
toan tap » toan ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((doi hieu) OR (doi chieu)) lang - hanh trinh luat dung ((cong hach) or (cong khanh)) toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi hieu) OR (doi chieu)) lang - hanh trinh luat dung ((cong hach) OR (cong khanh)) toan tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doi hieu) OR (doi chieu)) lang - hanh trinh luat dung ((cong hach) or (cong khanh)) toan tap".
• Adding a wildcard symbol may retrieve word variants: ((doi hieu) OR (doi chieu)) lang - hanh trinh luat dung ((cong hach) or (cong khanh)) toan tap*.