Reddit reviews Avengers: Nights of Wundagore

For Scarlet witch:

Nights of Wundagore: https://www.amazon.com/Avengers-Nights-Wundagore-David-Michelinie/dp/0785137211

Vision and the Scarlet Witch: https://www.amazon.com/Vision-Scarlet-Witch-1985-1986-12-ebook/dp/B01BT87YIW/ref=sr_1_9?keywords=vision+and+the+scarlet+witch&qid=1557511079&s=gateway&sr=8-9

Dan Abnett Mini from the 90s: https://www.amazon.com/SCARLET-WITCH-January-LANNING-ABNETT/dp/B001FW4UGM/ref=sr_1_3?keywords=scarlet+witch+dan+abnett&qid=1557510502&s=books&sr=1-3-catcorr

Busiek's run on Avengers: https://www.amazon.com/Avengers-Assemble-Vol-1998-2004-ebook/dp/B00AR0655M/ref=sr_1_1?keywords=kurt+busiek+avengers&qid=1557510533&s=books&sr=1-1

Her latest solo by James Robinson: https://www.amazon.com/Scarlet-Witch-Vol-Witches-Road/dp/078519682X/ref=sr_1_3?keywords=robinson+scarlet+witch&qid=1557510680&s=books&sr=1-3

For Scarlet Witch with Doctor Strange:

Doctor Strange Vol 2 #60: https://marvel.fandom.com/wiki/Doctor_Strange_Vol_2_60

Scarlet Witch appeared in some issues of Aaron's run on Doctor Strange. I think it was specifically in the Last Days of Magic arc: https://www.amazon.com/Doctor-Strange-Vol-Last-Magic/dp/0785199330/ref=pd_lpo_sbs_14_t_2?_encoding=UTF8&psc=1&refRID=ZK90Y8QR9PR1KMBVSGPF

She also appeared in some issues of Doctor Strange: Damnation: https://www.amazon.com/Doctor-Strange-Damnation-Complete-Collection/dp/1302912607

For Doctor Strange by himself:

Triumph and Torment: https://www.amazon.com/Doctor-Strange-Doom-Triumph-Torment/dp/0871356600

The Oath: https://www.amazon.com/Doctor-Strange-Brian-K-Vaughan/dp/0785187863/ref=pd_lpo_sbs_14_t_1?_encoding=UTF8&psc=1&refRID=BY8T0W99BRQ3983J7D1P

Into Shamballa: https://www.amazon.com/Doctor-Strange-Shamballa-Marvel-Graphic/dp/0871351668

It's hard to point out particular stories for Scarlet Witch and Quicksilver, because for the majority of their existences they've been supporting players in the Avengers, and ever since Avengers Disassembled in 2004 they've been barely seen anywhere.

Back in the 80s though, there was a Vision and Scarlet Witch mini-series that's a good read. It looks like you can get it on Amazon for a good deal: http://amzn.com/0785117709

The Avengers story Nights of Wundagore deals with Quicksilver and the Scarlet Witch's origins, it's also good: http://amzn.com/0785137211

Kurt Busiek's late 90s run on the Avengers is a good read, and features Scarlet Witch quite a bit, though Quicksilver a bit less: http://amzn.com/0785144986