Perhaps you should try some spelling variations:
"du an xay dung lan van ban ly nam Đinh" » "du an xay dung luan van ban ly nam Đinh", "du an xay dung land van ban ly nam Đinh", "du an xay dung lam van ban ly nam Đinh", "du an xay dung lang van ban ly nam Đinh", "du an xay dung san van ban ly nam Đinh", "du an xay dung lan van ban lay nam Đinh", "du an xay dung lan van bang ly nam Đinh", "du an xay dung lan van ban le nam Đinh"
"du an xay dung tan van ban ly nam Đinh" » "du an xay dung toan van ban ly nam Đinh", "du an xay duong tan van ban ly nam Đinh", "du an xay dung tai van ban ly nam Đinh", "du an xay dung tran van ban ly nam Đinh", "du an xay dung tang van ban ly nam Đinh", "du an xay dung luan van ban ly nam Đinh", "du an xay dung tan van ban lay nam Đinh", "du an xay dung tan van bang ly nam Đinh", "du an xay dung tan van ban le nam Đinh"

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