This is utterly 'unreadable' due to the 'authors' habit of putting every third or 'fourth' word like 'this'. I got about 5 pages 'in' before my ears started 'bleeding'. Whoever 'proofread' it should be made to go to each 'person' who bought this and 'apologise'.
In all seriousness, finding a typo in a book is like walking along a street and tripping over an uneven paving stone. Your concentration is gone, it is unprofessional and you end up concentrating on where the next one is, rather than what the book is actually saying.