Perhaps you should try some spelling variations:
"du an xay dung lan van ban le nam Đinh" » "du an xay dung land van ban le nam Đinh", "du an xay dung lam van ban le nam Đinh", "du an xay dung san van ban le nam Đinh", "du an xay dung lang van ban le nam Đinh", "du an xay dung tan van ban le nam Đinh", "du an xay dung lan van ban ve nam Đinh", "du an xay dung lan van ban ly nam Đinh", "du an xay dung lan van ban he nam Đinh", "du an xay dung lan van ban le na Đinh"
"du an xay dung luan van ban le nam Đinh" » "du an xay dung luan van ban ve nam Đinh", "du an xay dung luan van ban ly nam Đinh", "du an xay dung luan van ban he nam Đinh", "du an xay dung luan van ban le na Đinh", "du an xay dung quan van ban le nam Đinh"

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