Imo it is not possible for google to detect properly spun content, it is not worth computing power it requires. They can do this using ngrams for example, but it is uses a lot of queries. And for example article spinner I coded beats this algo, so google cant detect that the content is spun. Manual spinning is also good but it takes more than 30 minutes per article.

New customers will be given a discount offer that is massive. You are given a lot of quality written articles in a brief time period by spin Rewriter. After 5 days you get 30 days to make sure the Spin Rewriter technology is right for you, although for using their services, clients receive a 5-day free trial. They permit you to prevent SEO devaluation from content that is online that is duplicate. Try it out, and when it is not exactly right for your business, you’ll be given.

I put the keyword in Google search, Open the first top 5 websites copy the content, manually edit those content add or remove good lines and convert 5 articles into 1 good article, then copy to spinner chief and rewrite manually. Add some good infographics made by me or stock images and embed my hand made video . my niche is, "how-to" "tutorials" so I can manually make some video. So can I rank this type of contents? With some pbn or web2.0
The process is very simple, article rewriter tool will scan through the given content for the words that it can replace with a synonym. If article spinner will come across a word that it can replace with a substitute then it is switched with one of the suitable substitutes and is highlighted, making it easier for you to identify. However, you can click the word if you want to revert to the original text, find a different suggestion or add your own text.
A website with lots of unique and human-readable content is going to give you the best ROI. The more quality readable content your website has, the more exposure it will get from major search engines such as Google & Yahoo. But creating unique content takes time as you first need to develop content creation strategies and then you need some hours to write a full SEO optimized content. How great it would be if you can produce quality content within minutes! Yes, it's possible with the help of this free Article Rewriter Tool developed by SeoToolStation.