Perhaps you should try some spelling variations:
dang cong » dung cong
vang phan » van phan, quang phan, va phan
nang phan » nang phat, nang thanh, nang quan
ho chieu » theo chieu, hoc thieu, doi chieu
doc hieu » toc thieu, hoc thieu, hoc hien
tranh va » tranh van, trang va, trinh va
va dang » van dang, va nang, va lang

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((ho chieu) or (doc hieu)) xanh - canh tranh va dang cong ((vang phan) OR (nang phan)) cac~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chieu) OR (doc hieu)) xanh - canh tranh va dang cong ((vang phan) OR (nang phan)) cac.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chieu) or (doc hieu)) xanh - canh tranh va dang cong ((vang phan) OR (nang phan)) cac".
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) or (doc hieu)) xanh - canh tranh va dang cong ((vang phan) OR (nang phan)) cac*.