Perhaps you should try some spelling variations:
"du an xay dung luan van bang ly nam Đinh" » "du an xay dung luan van nang ly nam Đinh", "du an xay dung luan von bang ly nam Đinh", "du an xay dung luan van hang ly nam Đinh", "du an xay dung quan van bang ly nam Đinh", "du an xay dung lan van bang ly nam Đinh"
"du an xay dung luan van ban ky nam Đinh" » "du an xay dung luan van van ky nam Đinh", "du an xay dung luan van dan ky nam Đinh", "du an xay dung luan van ban uy nam Đinh", "du an xay dung quan van ban ky nam Đinh", "du an xay dung lan van ban ky nam Đinh"

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