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One way to search for plagiarism is to run a part of the text through Google search engine for matches. You can customize your search by adding quotes to the text, this would create a search for the exact text and not related ones which search engines normally use. This is good for exposing copy pastes, but would not exactly work for word spinners and paraphrases
There are also some plagiarism tool, but I've personally not used any of them.
Thanks you for the way out for the ideology to run a plagarism test, the knowledge you impact on me, to be sincere i have not done that before and i will practice it in order to check what will be the outcome, I'm glad for this knowledge, on my own i taught we have a specific data use to carry out the test of plagarism. But since you have explained it to my liking i will definitely carry on the practical example.
I can also suggest that you try the more thorough search that Google can do. To do this, not only quotes are used, but also other symbols and operators.