All vocabulary and grammar of the Practical Audio Visual Chinese book series can be found in here. I created it to easily lookup examples and find grammar patterns over all the examples provided in the books.
The vocabulary/grammar of the following books is in the database:
Practical Audio Visual Chinese 1 (not yet in database)
Practical Audio Visual Chinese 2
Practical Audio Visual Chinese 3
Practical Audio Visual Chinese 4 (not yet in database)
More to come.