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If they are truly deleted and not just "missing", then I am afraid you wont be able to restore them. Smartphones (Android, iPhone, etc.) work different from computers - when a file is deleted it isn't stored in the "trash" where you can "undelete" it. Once its deleted, the memory is used to write new data and it cannot be undone.
However, there is a chance its not actually deleted. Open the Play Store app and install a free app called GO SMS Pro
. Once you install it, open the app and it will scan your device for any text message files and load them. if it doesnt find the ones you are missing, then unfortunately they are gone.
If you have any further questions, please feel free to let me know
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