Perhaps you should try some spelling variations:
doanh doanh » toan doanh, doanh hoan, doanh thanh
thiet hach » thien hach, thuyet hach, thiet hai
canh doanh » hanh doanh, chinh doanh, kinh doanh
hoc thiet » hoc thieu, hoc thuyet, hoc hien
dang cong » dung cong
cua dang » cua cong, cua ban
cong san » cong tac
pham lap » phan lap, pham lan, pham gap

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 - ((canh doanh) or (doanh doanh)) cua dang cong san pham lap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thiet hach - ((canh doanh) OR (doanh doanh)) cua dang cong san pham lap*.