i'm looking for touhou manga/doujinshi in series not oneshot, for example : Touhou Bougetsushou: Tsuki no Inaba to Chijou no Inaba

The canon series:

Touhou Ibarakasen - Wild and Horned Hermit
Silent Sinner in Blue
Touhou Sangetsusei: Oriental Sacred Place
Touhou Bougetsushou: Tsuki no Inaba to Chijou no Inaba
Touhou Sangetsusei: Eastern and Little Nature Deity
Touhou Sangetsusei: Strange and Bright Nature Deity
which are all made by ZUN

Some doujin series:

Touhou dj - Touhou Battle Royale
Touhou dj - Miko Miko Suika
Touhou dj - Omoito
Touhou dj - Scarlet Moon, Jasper Star
Touhou dj - Stories of Sakuya
Touhou dj - Madness in Bloom
Touhou dj - Cirno and Reimu's 1-2-3

And of course there are tons and tons more listed in where I grabbed these from. I personally haven't read them. Good luck, I hope you find what you're looking for.

Ooooohhh...
Thanks a lot.
you like touhou so much huh? same here

One of my personal favorites is
Touhou dj - Advent Cirno

Being alone is only lonely if you want it to be.
Staying in lucid delusion for an eternity.