Perhaps you should try some spelling variations:
thanh duong » thanh huong, thanh cuong, thanh vuong
thiet tach » chiet tach, thien hach, thuat tach
thanh tung » thanh cong
nhua nang » chua nang, nhua mang, thuat nang
nang cong » nang song, dang cong, bang cong
ho thiet » hoc thiet, hoa thiet, so thiet
cong tac » cong ty
nhan cau » nhanh cau, nhan sau, nhin cau
phan cau » phan dau, phan cac, phan tu

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 - ((thanh tung) or (thanh duong)) nhua nang cong tac ((nhan cau) OR (phan cau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho thiet tach - ((thanh tung) OR (thanh duong)) nhua nang cong tac ((nhan cau) OR (phan cau))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho thiet tach - ((thanh tung) or (thanh duong)) nhua nang cong tac ((nhan cau) OR (phan cau))*".