Perhaps you should try some spelling variations:
"du an xay dung luan van ban loai nam Đinh" » "du an xay dung luan van dan loai nam Đinh", "du an xay dung luan van phan loai nam Đinh", "du an xay dung luan van nhan loai nam Đinh", "du an xay dung luan van ban hai nam Đinh", "du an xay dung quan van ban loai nam Đinh", "du an xay dung lan van ban loai nam Đinh"
"du an xay dung luan van ban lai nam Đinh" » "du an xay dung luan van ban gai nam Đinh", "du an xay dung luan van ban tai nam Đinh", "du an xay dung luan van ban lay nam Đinh", "du an xay dung luan van ban hai nam Đinh", "du an xay dung luan van ban mai nam Đinh", "du an xay dung luan van ban dai nam Đinh", "du an xay dung quan van ban lai nam Đinh", "du an xay dung lan van ban lai nam Đinh"

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• Performing a fuzzy search may retrieve terms with similar spellings: (("du an xay dung luan van ban lai nam Đinh") OR ("du an xay dung luan van ban loai nam Đinh"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"du an xay dung luan van ban lai nam Đinh\") OR (\"du an xay dung luan van ban loai nam Đinh\"))".
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• Adding a wildcard symbol may retrieve word variants: (("du an xay dung luan van ban lai nam Đinh") OR ("du an xay dung luan van ban loai nam Đinh"))*.