Perhaps you should try some spelling variations:
cong khanh » cong thanh, cong khan, cong nhan
hanh trinh » canh tranh, hanh chinh
hieu lang » chieu sang, hieu quang, nhieu tang
luat dung » suat dung, luat chung, luat quang
cong hach » cong sach, cong thanh, trong hach
doi hieu » doi chieu, doc hieu, doi hien
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 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 lang - hanh trinh luat dung ((cong hach) OR (cong khanh)) toan tap".
• Adding a wildcard symbol may retrieve word variants: doi hieu lang - hanh trinh luat dung ((cong hach) OR (cong khanh)) toan tap*.