Perhaps you should try some spelling variations:
thanh tuong » thanh thuong, thanh tung, thanh huong
dang thanh » dong thanh, dang hanh, hoang thanh
hoc thiet » hoc thieu, hoc thuyet, hoc hien
dan thong » ban thong, dan phong, van thong
dan trong » ban trong, dat trong, dao trong
cong dang » cong dong, cong dan, cong dung
thanh lap » thanh san, phan lap, thanh hai
ho thiet » hoa thiet, so thiet, hoc thieu

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 (ho thiet)) tach - thanh tuong ((dan thong) OR (dan trong)) cong dang thanh lap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc thiet) OR (ho thiet)) tach - thanh tuong ((dan thong) OR (dan trong)) cong dang thanh lap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc thiet) or (ho thiet)) tach - thanh tuong ((dan thong) OR (dan trong)) cong dang thanh lap".
• Adding a wildcard symbol may retrieve word variants: ((hoc thiet) or (ho thiet)) tach - thanh tuong ((dan thong) OR (dan trong)) cong dang thanh lap*.