Perhaps you should try some spelling variations:
cong thanh » dong thanh, cong trinh, cong tan
thanh tram » thanh tra, thanh tam, thanh tran
hoc thiet » hoc thieu, hoc thuyet, hoc hien
tao thiet » tai thiet, tay thiet, toan thiet
hanh tram » hanh tam, hanh trang, thanh tran
dung cong » dung trong
tram van » tran van, tam van, trang van
van dung » van dong, xay dung, tin dung
tram ban » tam ban, tranh ban, tram bien

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 (tao thiet)) tach - hanh tram van dung cong thanh tram ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc thiet) OR (tao thiet)) tach - hanh tram van dung cong thanh tram ban.
• Adding a wildcard symbol may retrieve word variants: ((hoc thiet) or (tao thiet)) tach - hanh tram van dung cong thanh tram ban*.