Perhaps you should try some spelling variations:
duong cong » dung cong, luong cong, duong trong
hanh manh » hanh mang, lanh manh, hoang manh
dang cong » dung cong
khao cuu » cham cuu, chao chu, kho cua
manh cua » doanh cua, ban cua
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: khao cuu tinh - hanh manh cua ((dang cong) or (duong cong)) tac toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: khao cuu tinh - hanh manh cua ((dang cong) OR (duong cong)) tac toan ban.
• Adding a wildcard symbol may retrieve word variants: khao cuu tinh - hanh manh cua ((dang cong) or (duong cong)) tac toan ban*.