Perhaps you should try some spelling variations:
toc chieu » doc hieu, hoc thieu, mot chieu
canh tran » canh tranh, hanh trang, banh trang
dung cong » dung trong
tran van » luan van
van dung » van dong, xay dung, tin dung
cong van » cong vang, cong san, song van
van than » van thanh, van thang, van tuan
than ban » thanh ban, toan ban, than man

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((toc chieu) or (toc thieu)) xanh - canh tran van dung cong van than ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc chieu) OR (toc thieu)) xanh - canh tran van dung cong van than ban*.