Perhaps you should try some spelling variations:
canh trang » canh tranh, hanh trang, banh trang
cong thang » cong thanh, cang thang, cong thong
hoc thiet » hoc thieu, hoc thuyet, hoc hien
dang cong » dung cong
thang ban » hang ban, tang ban, thanh ban
trang va » tran van, hang va
va dang » van dang, va nang, va lang
ban dan » ban hang, ban hanh, ban quan

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

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