Perhaps you should try some spelling variations:
hoc thieu » toc thieu, hoc hien
canh tran » canh tranh, hanh trang, banh trang
dong cong » duong cong, dung cong, dang cong
ho chieu » theo chieu, mot chieu, doi chieu
duc dong » duoc dong, duc dung, duc cong
cong tan » cong tac, cong san, cong thanh
tan van » tran van, tang van, luan van

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 (hoc thieu)) xanh - canh tran duc dong cong tan van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chieu) OR (hoc thieu)) xanh - canh tran duc dong cong tan van ban*.