Perhaps you should try some spelling variations:
thanh trung » thanh tung
cong thanh » dong thanh, cong trinh, cong tan
hoa thiet » hoc thiet, toan thiet, hoa viet
trung cua » truong cua, trung tuan, trung cap
ho thiet » hoc thiet, so thiet, hoc thieu
cong san » cong tac
toan ban » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((ho thiet) OR (hoa thiet)) tach - thanh trung cua ban ((cong thanh) or (cong san)) toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho thiet) OR (hoa thiet)) tach - thanh trung cua ban ((cong thanh) OR (cong san)) toan ban*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho thiet) OR (hoa thiet)) tach - thanh trung cua ban ((cong thanh) or (cong san)) toan ban*".