Perhaps you should try some spelling variations:
sang thanh » dang thanh, sang than, tang thanh
hieu manh » chieu xanh, hieu nganh, dieu hanh
hien hanh » dieu hanh
chinh cua » chinh ca, hinh cua, chinh luan
chinh sua » chinh su, chinh luan, hinh su
hang cong » dang cong, hang nong, bang cong
cong sang » cong san, cong lang, cong vang
thanh lap » thanh san, phan lap, thanh hai

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 (hien hanh)) - hanh ((chinh cua) OR (chinh sua)) hang cong sang thanh lap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu manh) OR (hien hanh)) - hanh ((chinh cua) OR (chinh sua)) hang cong sang thanh lap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hieu manh) or (hien hanh)) - hanh ((chinh cua) OR (chinh sua)) hang cong sang thanh lap".
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu manh) or (hien hanh)) - hanh ((chinh cua) OR (chinh sua)) hang cong sang thanh lap*.