Perhaps you should try some spelling variations:
rain » brain (Expand Search), main (Expand Search), gain (Expand Search)
btttrain » btttbrain (Expand Search), btttmain (Expand Search), btttgain (Expand Search), bttbrain (Expand Search)
btrain » btbrain (Expand Search), btmain (Expand Search), btgain (Expand Search), brain (Expand Search), strain (Expand Search), bbrain (Expand Search)
train » tbrain (Expand Search), tmain (Expand Search), tgain (Expand Search), brain (Expand Search)
bmain » main (Expand Search), brain (Expand Search)
stmain » strain (Expand Search), smain (Expand Search)
bttmain » btmain (Expand Search)
btmain » bmain (Expand Search)
tmain » main (Expand Search)
bagain » bargain (Expand Search), again (Expand Search)
btttgain » bttgain (Expand Search), bttagain (Expand Search)
btgain » bgain (Expand Search), bagain (Expand Search)
tgain » gain (Expand Search), again (Expand Search)

You may be able to get more results by adjusting your search query.

• Removing quotes may allow a broader search: ((rain OR ((bmain OR bmain) OR ((stmain OR (bttmain OR (btttrain OR btttgain))) OR ((btgain OR ((btrain OR btmain) OR (train OR tmain))) OR bagain)))) OR tgain) tax.

Perform this same search in other libraries for books (WorldCat)

Perform this same search in EDS

You can also try:

• Request through Interlibrary Loan