If you google it here is what comes up:
'
TGCA
Taiwan General Contractors Association

1

TGCA
Taiwan Guidance and Counseling Association

1

TGCA
Texas Girls Coaches Association
Texas, Coaching, Girl

1

TGCA
Texas Grocery & Convenience Association

1

TGCA
Texas Grocery and Convenience Association

1

TGCA
Texas Gun Collectors Association
Collector, Gun, Texas

1

TGCA
The Genome Customization Award

1

TGCA
Traditional Gypsy Cob Association
Gypsy, Horse, Stallion

1

TGCA
Transportable Group Control Approach

1

TGCA
Triple Grand Champion Alter'
I'm sure there are more.