Perhaps you should try some spelling variations:
"du an xay dung luan van ban tay nam Đinh" » "du an xay dung luan van ban tai nam Đinh", "du an xay dung luan van ban than nam Đinh", "du an xay dung luan van gian tay nam Đinh", "du an xay dung quan van ban tay nam Đinh", "du an xay dung lan van ban tay 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 ly 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 quan van ban le nam Đinh", "du an xay dung lan van ban le nam Đinh"

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