Perhaps you should try some spelling variations:
thanh trung » thanh tung
hieu xanh » chieu xanh, hieu nganh, dieu hanh
hieu manh » chieu xanh, hieu nganh, dieu hanh
trung tac » trung tam, trong tac, trung tai
dung cong » dung trong
tac dung » sach dung, xay dung, tin dung
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
toan ban » van ban

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: doc ((hieu xanh) or (hieu manh)) - thanh trung tac dung cong tac toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu xanh) OR (hieu manh)) - thanh trung tac dung cong tac toan ban.
• Adding a wildcard symbol may retrieve word variants: doc ((hieu xanh) or (hieu manh)) - thanh trung tac dung cong tac toan ban*.