Perhaps you should try some spelling variations:
chuan trang » xuan trang, chu trang, nhuan trong
chuan nang » chua nang, chuc nang, luan nang
doc hieu » toc thieu, hoc thieu, hoc hien
ho chieu » theo chieu, hoc thieu, mot chieu
cong san » cong tac
san phan » san pham, van phan, sat 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: ((doc hieu) or (ho chieu)) xanh - canh tranh ((chuan nang) OR (chuan trang)) cong san phan dau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc hieu) OR (ho chieu)) xanh - canh tranh ((chuan nang) OR (chuan trang)) cong san phan dau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doc hieu) or (ho chieu)) xanh - canh tranh ((chuan nang) OR (chuan trang)) cong san phan dau".
• Adding a wildcard symbol may retrieve word variants: ((doc hieu) or (ho chieu)) xanh - canh tranh ((chuan nang) OR (chuan trang)) cong san phan dau*.