Perhaps you should try some spelling variations:
"du an xay dung luan van ban tay nam Đinh" » "du an xay dung luan van ban than nam Đinh", "du an xay dung luan van gian tay nam Đinh", "du an xay dung luan van canh tay nam Đinh", "du an xay dung quan van ban tay nam Đinh", "du an xay dung lan van ban tay nam Đinh"
"du an xay dung luan van ban tai nam Đinh" » "du an xay dung luan van van tai nam Đinh", "du an xay dung luan van han tai nam Đinh", "du an xay dung luan van ban thi nam Đinh", "du an xay dung luan van ban thai 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 quan van ban tai nam Đinh", "du an xay dung lan van ban tai nam Đinh"

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