Perhaps you should try some spelling variations:
bang cong » dang cong, bang song, hang cong
hien anh » hien hanh, thien anh, tien anh
dien anh » tieng anh, dien dan
tranh va » tranh van, trang va, trinh va
cong san » cong tac
san chan » san chang, dan chan, san chay
chan cau » phan cau, can cau, chinh cau
va bang » va nang, va lang, va ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hien anh) or (dien anh)) - canh tranh va bang cong san chan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien anh) OR (dien anh)) - canh tranh va bang cong san chan cau.
• Adding a wildcard symbol may retrieve word variants: hoc ((hien anh) or (dien anh)) - canh tranh va bang cong san chan cau*.