Perhaps you should try some spelling variations:
"du an xay dung lan van ban lay nam Đinh" » "du an xay dung land van ban lay nam Đinh", "du an xay dung lam van ban lay nam Đinh", "du an xay dung san van ban lay nam Đinh", "du an xay dung lang van ban lay nam Đinh", "du an xay dung tan van ban lay nam Đinh", "du an xay dung lan van ban tay nam Đinh", "du an xay dung lan van ban lai nam Đinh", "du an xay dung lan van ban lap nam Đinh"
"du an xay dung luan van ban ly 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 luan van ban ky nam Đinh", "du an xay dung quan 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 lan van ban lay 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 lan van ban lay nam Đinh")).
• Removing quotes may allow a broader search: (( du an xay dung luan van ban ly nam Đinh ) or ( du an xay dung lan van ban lay 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 lan van ban lay nam Đinh"))*.