Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
hieu lang » chieu sang, hieu quang, nhieu tang
luat dung » suat dung, luat chung, luat quang
trong tac » tuong tac, trong tuc, trong tai
trong tan » trong quan, trong ca, cong tan
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 ((trong tac) or (((trong tan) OR (trong cac)))) toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi hieu lang - hanh trinh luat dung ((trong tac) OR (((trong tan) OR (trong cac)))) toan tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi hieu lang - hanh trinh luat dung ((trong tac) or (((trong tan) OR (trong cac)))) toan tap".
• Adding a wildcard symbol may retrieve word variants: doi hieu lang - hanh trinh luat dung ((trong tac) or (((trong tan) OR (trong cac)))) toan tap*.