Perhaps you should try some spelling variations:
hien hanh » dieu hanh
dang cong » dung cong
san chang » ban hang, dan chan, van khang
hien anh » thien anh, dien anh, tien anh
tranh va » tranh van, trang va, trinh va
san chan » dan chan, san chay, ban chan
va dang » van dang, va nang, va lang

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 (hien hanh)) - canh tranh va dang cong ((san chan) OR (san chang)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien anh) OR (hien hanh)) - canh tranh va dang cong ((san chan) OR (san chang)) cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien anh) or (hien hanh)) - canh tranh va dang cong ((san chan) OR (san chang)) cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien anh) or (hien hanh)) - canh tranh va dang cong ((san chan) OR (san chang)) cau*.