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 » trong cac, tuong tac, trong tuc
trong tan » trong quan, trong cac, trong ca
doi hieu » doi chieu, doc hieu, doi hien
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: doi hieu lang - hanh trinh luat dung ((trong tac) or (trong tan)) ((toan tap) OR (toan ban))~.
• 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)) ((toan tap) OR (toan ban)).
• 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)) ((toan tap) OR (toan ban))".
• Adding a wildcard symbol may retrieve word variants: doi hieu lang - hanh trinh luat dung ((trong tac) or (trong tan)) ((toan tap) OR (toan ban))*.