Perhaps you should try some spelling variations:
thanh tuong » thanh thuong, thanh tung, thanh huong
hoc thuyet » hoc chuyen
hoc thiet » hoc thieu, hoc hien, toc thieu
hang cong » dang cong, bang cong, thanh cong
hang nong » thang long, han tong
lan chinh » luan chinh, van chinh, hanh chinh
chinh can » chinh ca, chinh ban, chinh cau
tuong va » truong va, thuong va, luong va

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoc thiet) OR (hoc thuyet)) tach - thanh tuong va ((hang cong) or (hang nong)) lan chinh can~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc thiet) OR (hoc thuyet)) tach - thanh tuong va ((hang cong) OR (hang nong)) lan chinh can.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc thiet) OR (hoc thuyet)) tach - thanh tuong va ((hang cong) or (hang nong)) lan chinh can".
• Adding a wildcard symbol may retrieve word variants: ((hoc thiet) OR (hoc thuyet)) tach - thanh tuong va ((hang cong) or (hang nong)) lan chinh can*.