Perhaps you should try some spelling variations:
thong cong » trong cong, tong cong, thong thong
doi chieu » doi chi, ho chieu, thi chieu
mot chieu » ho chieu
doc hieu » toc thieu, hoc thieu, hoc hien
tranh va » tranh van, trang va, trinh va
va thong » va thuong, va phuong, he thong
cong tac » cong ty
tac than » tac thanh, tam than, tac nhan
than cao » toan cao, thai cao, than cap

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 (mot chieu))) or (doc hieu)) xanh - canh tranh va thong cong tac than cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((doi chieu) OR (mot chieu))) OR (doc hieu)) xanh - canh tranh va thong cong tac than cao*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((doi chieu) OR (mot chieu))) or (doc hieu)) xanh - canh tranh va thong cong tac than cao*".