Perhaps you should try some spelling variations:
van thuong » va thuong, van chuong, van phuong
doi chieu » doc hieu, doi chi, ho chieu
hoc thieu » toc thieu, hoc hien
van thong » van phong, va thong, van thang
cong tan » cong tac, cong san, cong thanh
tan phan » toan phan, than phan, van phan
phan dau » phan tu, hang dau

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 (hoc thieu)) xanh - canh tranh ((van thong) OR (van thuong)) cong tan phan dau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chieu) OR (hoc thieu)) xanh - canh tranh ((van thong) OR (van thuong)) cong tan phan dau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doi chieu) or (hoc thieu)) xanh - canh tranh ((van thong) OR (van thuong)) cong tan phan dau".
• Adding a wildcard symbol may retrieve word variants: ((doi chieu) or (hoc thieu)) xanh - canh tranh ((van thong) OR (van thuong)) cong tan phan dau*.