Perhaps you should try some spelling variations:
thien thanh » tien thanh, thi thanh, hien hanh
nhung cong » thong cong, hang cong, nhung don
sang thanh » dang thanh, sang than, tang thanh
hieu manh » chieu xanh, hieu nganh, dieu hanh
chinh cua » chinh ca, chinh sua, hinh cua
dung cong » dung trong
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 (thien thanh)) - hanh chinh cua ((nhung cong) OR (dung cong)) sang thanh lap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu manh) OR (thien thanh)) - hanh chinh cua ((nhung cong) OR (dung cong)) sang thanh lap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hieu manh) or (thien thanh)) - hanh chinh cua ((nhung cong) OR (dung cong)) sang thanh lap".
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu manh) or (thien thanh)) - hanh chinh cua ((nhung cong) OR (dung cong)) sang thanh lap*.