Perhaps you should try some spelling variations:
"tac gia đoat giai nobel kinh te 2002" » "tac gia đoat giai nobel kinh te 2008", "tac gia đoat giai nobel kinh tue 2005", "tac gia đoat giai novel kinh te 2002", "tac gia đoat giai nobel dinh te 2002", "tac gia đoat giai nobel minh te 2002"
"tac gia đoat giai nobel dich te 2005" » "tac gia đoat giai nobel dich tue 2005", "tac gia đoat giai nobel dich ke 2005", "tac gia đoat giai nobel dich te 2008", "tac gia đoat giai novel dich te 2005", "tac gia đoat giai nobel dinh te 2005"

Try widening your search to All Fields.

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("tac gia đoat giai nobel kinh te 2002") or ("tac gia đoat giai nobel dich te 2005"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("tac gia đoat giai nobel kinh te 2002") OR ("tac gia đoat giai nobel dich te 2005")).
• Removing quotes may allow a broader search: (( tac gia đoat giai nobel kinh te 2002 ) or ( tac gia đoat giai nobel dich te 2005 )).
• Adding a wildcard symbol may retrieve word variants: (("tac gia đoat giai nobel kinh te 2002") or ("tac gia đoat giai nobel dich te 2005"))*.