That was the whole point of philosophy to begin with! Later on it got diverted inside modern universities into pretty much wordplay...
For a good overview of the various ancient schools there's a book by an English author, Jules Evans, 'Philosophy for Life and Other Dangerous Situations'
For specifically Existential philosophy get the book by W. Barrett 'Irrational Man'
There's a Texas professor with a series of lectures on youtube concerning 20th century philosophy, 'The Self Under Siege'
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