Perhaps you should try some spelling variations:
"du an xay dung lam van quan ly nam Đinh" » "du an xay dung tai van quan ly nam Đinh", "du an xay dung dat van quan ly nam Đinh", "du an xay dung ha van quan ly nam Đinh", "du an xay dung lam san quan ly nam Đinh", "du an xay dung nam van quan ly nam Đinh", "du an xay dung dam van quan ly nam Đinh"
"du an xay dung luan van ban ly nam Đinh" » "du an xay dung luan van ban lay nam Đinh", "du an xay dung luan van bang ly nam Đinh", "du an xay dung luan van ban le nam Đinh", "du an xay dung lan van ban ly nam Đinh"

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• Performing a fuzzy search may retrieve terms with similar spellings: (("du an xay dung luan van ban ly nam Đinh") or ("du an xay dung lam van quan ly nam Đinh"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("du an xay dung luan van ban ly nam Đinh") OR ("du an xay dung lam van quan ly nam Đinh")).
• Removing quotes may allow a broader search: (( du an xay dung luan van ban ly nam Đinh ) or ( du an xay dung lam van quan ly nam Đinh )).
• Adding a wildcard symbol may retrieve word variants: (("du an xay dung luan van ban ly nam Đinh") or ("du an xay dung lam van quan ly nam Đinh"))*.