Perhaps you should try some spelling variations:
tong cong » trong cong, cong cong, dung cong
doc hieu » toc thieu, hoc thieu
tang qua » tang quan, tang cua, tang quang
tang quy » tan quy, nang quy, tang quan
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) OR (hoc hien)) xanh - anh ((tang qua) or (tang quy)) tong cong tac toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc hieu) OR (hoc hien)) xanh - anh ((tang qua) OR (tang quy)) tong cong tac toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doc hieu) OR (hoc hien)) xanh - anh ((tang qua) or (tang quy)) tong cong tac toan ban".
• Adding a wildcard symbol may retrieve word variants: ((doc hieu) OR (hoc hien)) xanh - anh ((tang qua) or (tang quy)) tong cong tac toan ban*.