Perhaps you should try some spelling variations:
nhuong cong » nhung cong, luong cong, duong cong
thanh tran » thanh trang, thanh toan, thanh tra
van nhuong » van chuong, van phuong, van huong
tran van » luan van
tang van » dang van, hoang van, trong van
do dien » doi dien, co dien, duoc dien
tan van » luan van, dang van, tan tran
o dien » co dien

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((do dien) or (o dien)) sach - thanh tran van nhuong cong ((tan van) OR (tang van)) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((do dien) OR (o dien)) sach - thanh tran van nhuong cong ((tan van) OR (tang van)) ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((do dien) or (o dien)) sach - thanh tran van nhuong cong ((tan van) OR (tang van)) ban".
• Adding a wildcard symbol may retrieve word variants: ((do dien) or (o dien)) sach - thanh tran van nhuong cong ((tan van) OR (tang van)) ban*.