Perhaps you should try some spelling variations:
hoc thieu » hoc hien
canh tran » canh tranh, hanh trang, banh trang
dang cong » dung cong
cong hang » cong thang, cong hung, cong lang
tran van » luan van
van dang » van dong, van dung, van nang
hang ban » hang luan, hang va, hang tai
ban can » ban dan, ban hang, ban hanh

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

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