Perhaps you should try some spelling variations:
thiet hach » thien hach, thuyet hach, thiet hai
doanh luan » doanh nhan
hoc thiet » hoc thieu, hoc thuyet, hoc hien
hang cong » dang cong, hang nong, bang cong
cong tai » cong thai, cong tac, dong tai
tai phan » tai thanh, tai phong, tai ngan
phan lap » phan dau

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 cua) or (doanh luan)) hang cong tai phan lap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thiet hach - canh ((doanh cua) OR (doanh luan)) hang cong tai phan lap.
• Adding a wildcard symbol may retrieve word variants: hoc thiet hach - canh ((doanh cua) or (doanh luan)) hang cong tai phan lap*.