Compare the two sentences below:
"During Tet, Vietnamese people buy all kinds of sweets. They make Chung cake as well."
During Tet, Vietnamese people buy all kinds of sweets and make Chung cake as well.
During Tet, Vietnamese people buy all kinds of sweets. Or they make Chung cake as well.
During Tet, Vietnamese people buy all kinds of sweets so they make Chung cake as well.
During Tet, Vietnamese people buy all kinds of sweets and make Chung cake as well.
During Tet, Vietnamese people buy all kinds of sweets and make Chung cake as well.