Perhaps you should try some spelling variations:
thiet tach » chiet tach, thien hach, thuat tach
thong cong » trong cong, tong cong, thong thong
doanh phan » doanh nhan, doan phan, doanh thanh
ho thiet » hoc thiet, hoa thiet, so thiet
trinh va » trinh van, trinh vat, trinh vi
trinh ve » trinh he, trinh vi, trinh viet
dam phan » d phan, va phan, van phan

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 tach - canh ((trinh va) OR (trinh ve)) thong cong ((dam phan) or (doanh phan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho thiet tach - canh ((trinh va) OR (trinh ve)) thong cong ((dam phan) OR (doanh phan)) cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho thiet tach - canh ((trinh va) OR (trinh ve)) thong cong ((dam phan) or (doanh phan)) cau".
• Adding a wildcard symbol may retrieve word variants: ho thiet tach - canh ((trinh va) OR (trinh ve)) thong cong ((dam phan) or (doanh phan)) cau*.