Perhaps you should try some spelling variations:
thong quang » thong quan, thong qua, luong quang
trong quan » thong quan, tong quan, luong quan
hieu xanh » chieu xanh, hieu manh, hieu nganh
doc hieu » toc thieu, hoc thieu, hoc hien
cong dan » cong san, huong dan, cong dong
cong tan » cong tac, cong san, cong thanh
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 hieu xanh - hanh ((trong quan) OR (thong quang)) dong ((cong dan) or (cong tan)) toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu xanh - hanh ((trong quan) OR (thong quang)) dong ((cong dan) OR (cong tan)) toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu xanh - hanh ((trong quan) OR (thong quang)) dong ((cong dan) or (cong tan)) toan ban".
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - hanh ((trong quan) OR (thong quang)) dong ((cong dan) or (cong tan)) toan ban*.