Perhaps you should try some spelling variations:
thanh dung » thanh duong, thanh tung, hanh dung
thanh hung » thanh huong, thanh tung, thanh trung
hoa thiet » toan thiet, hoa viet, va thiet
hoc thiet » hoc thieu, hoc thuyet, hoc hien
dung cong » dung trong
cua dung » cua dang, cua dong, qua dung
cong tan » cong tac, cong san, cong thanh
tan than » tan thanh, tan tran, ban than
than cao » toan cao, thai cao, than cap

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoa thiet) OR (hoc thiet)) tach - ((thanh dung) or (thanh hung)) cua dung cong tan than cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoa thiet) OR (hoc thiet)) tach - ((thanh dung) OR (thanh hung)) cua dung cong tan than cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoa thiet) OR (hoc thiet)) tach - ((thanh dung) or (thanh hung)) cua dung cong tan than cao".
• Adding a wildcard symbol may retrieve word variants: ((hoa thiet) OR (hoc thiet)) tach - ((thanh dung) or (thanh hung)) cua dung cong tan than cao*.