Perhaps you should try some spelling variations:
"du an xay dung lan van bang ly nam Đinh" » "du an xay dung land van bang ly nam Đinh", "du an xay dung lam van bang ly nam Đinh", "du an xay dung san van bang ly nam Đinh", "du an xay dung lan van nang ly nam Đinh", "du an xay dung lan von bang ly nam Đinh", "du an xay dung lan van hang ly nam Đinh", "du an xay dung lang van bang ly nam Đinh", "du an xay dung tan van bang ly nam 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 he nam Đinh", "du an xay dung luan van ban le na Đinh", "du an xay dung luan van ban te nam 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 lan van bang ly nam Đinh") or ("du an xay dung luan van ban le nam Đinh"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("du an xay dung lan van bang ly nam Đinh") OR ("du an xay dung luan van ban le nam Đinh")).
• Removing quotes may allow a broader search: (( du an xay dung lan van bang ly nam Đinh ) or ( du an xay dung luan van ban le nam Đinh )).
• Adding a wildcard symbol may retrieve word variants: (("du an xay dung lan van bang ly nam Đinh") or ("du an xay dung luan van ban le nam Đinh"))*.