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

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