Perhaps you should try some spelling variations:
hien anh » hien hanh, thien anh, tien anh
dien anh » tieng anh, dien dan
cong san » cong tac
san chay » san pham, van chat, dan chan
chay cao » cay cao, chat cao, nha cao
va bang » va nang, va ban, va hang
va lang » va nang, hoa 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 (dien anh)) - canh tranh ((va bang) OR (va lang)) cong san chay cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien anh) OR (dien anh)) - canh tranh ((va bang) OR (va lang)) cong san chay cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien anh) or (dien anh)) - canh tranh ((va bang) OR (va lang)) cong san chay cao".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien anh) or (dien anh)) - canh tranh ((va bang) OR (va lang)) cong san chay cao*.