Perhaps you should try some spelling variations:
hieu manh » chieu xanh, hieu nganh, dieu hanh
hieu lang » chieu sang, hieu quang, nhieu tang
chinh cua » chinh ca, chinh sua, hinh cua
cua trong » cua truong, cua trung, qua trong
cong bai » cuong bai, cung bai, cong ba
cong hai » cong thai, cong ha, hoang hai
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: hoc ((hieu manh) or (hieu lang)) - hanh chinh cua trong ((cong bai) OR (cong hai)) toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu manh) OR (hieu lang)) - hanh chinh cua trong ((cong bai) OR (cong hai)) toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hieu manh) or (hieu lang)) - hanh chinh cua trong ((cong bai) OR (cong hai)) toan ban".
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu manh) or (hieu lang)) - hanh chinh cua trong ((cong bai) OR (cong hai)) toan ban*.