Perhaps you should try some spelling variations:
thanh trung » thanh tung
hieu lang » chieu sang, hieu quang, nhieu tang
cua trong » cua truong, cua trung, qua trong
cong manh » duong manh, cong thanh, hoang manh
cong danh » cuong danh, cong dan, cong thanh
hoi hieu » hoi phieu, hoi tieu, moi 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: hoi hieu lang - ((thanh trung) or (hanh chinh)) cua trong ((cong manh) OR (cong danh)) toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoi hieu lang - ((thanh trung) OR (hanh chinh)) cua trong ((cong manh) OR (cong danh)) toan tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoi hieu lang - ((thanh trung) or (hanh chinh)) cua trong ((cong manh) OR (cong danh)) toan tap".
• Adding a wildcard symbol may retrieve word variants: hoi hieu lang - ((thanh trung) or (hanh chinh)) cua trong ((cong manh) OR (cong danh)) toan tap*.