Perhaps you should try some spelling variations:
thuong cong » thong cong, thuong con, thuong dong
doi chieu » doi chi, ho chieu, mot chieu
doc hieu » hoc thieu, hoc hien
tranh va » tranh van, trang va, trinh va
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
toan cao » toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((doi chieu) or (((doc hieu) OR (toc thieu)))) xanh - canh tranh va thuong cong tac toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chieu) OR (((doc hieu) OR (toc thieu)))) xanh - canh tranh va thuong cong tac toan cao*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doi chieu) or (((doc hieu) OR (toc thieu)))) xanh - canh tranh va thuong cong tac toan cao*".