Perhaps you should try some spelling variations:
theo chieu » theo tieu, ho chieu, theo chu
lang huong » lan huong, lang muong, lang tuong
huong doan » phuong doan, huong dan, huong loan
doc hieu » toc thieu, hoc thieu, hoc hien
tranh va » tranh van, trang va, trinh va
doan van » doan va, hoang van, luan van
va lang » va nang, hoa lang

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 (theo chieu)) xanh - canh tranh va lang huong doan van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc hieu) OR (theo chieu)) xanh - canh tranh va lang huong doan van ban.
• Adding a wildcard symbol may retrieve word variants: ((doc hieu) or (theo chieu)) xanh - canh tranh va lang huong doan van ban*.