Perhaps you should try some spelling variations:
thuyet hach » thuyet mach, thuyet xac, thuyet cac
thiet hach » thien hach, thiet hai, chiet tach
thanh tung » thanh cong
hang cong » dang cong, hang nong, bang cong
cua hang » cua dang, cua nhung, cua cong
cong san » cong tac
san co » ban co, sang cho
co cau » bo cau

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 hach) OR (thuyet hach)) - ((thanh trung) or (thanh tung)) cua hang cong san co cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thiet hach) OR (thuyet hach)) - ((thanh trung) OR (thanh tung)) cua hang cong san co cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thiet hach) OR (thuyet hach)) - ((thanh trung) or (thanh tung)) cua hang cong san co cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((thiet hach) OR (thuyet hach)) - ((thanh trung) or (thanh tung)) cua hang cong san co cau*.