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
trang van » tran van, trang va, trong van
dang cong » dung cong
thang ban » hang ban, tang ban, thanh ban
van dang » van dong, van dung, van nang
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: ((hoc thiet) or (toc thieu)) tach - canh trang van dang cong thang ban can~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc thiet) OR (toc thieu)) tach - canh trang van dang cong thang ban can*.