I tried to get a specific product variant by TemplateID and attributeValueID with the follow codes:
attributeValueIds = models.execute_kw(db, uid, password, 'product.template.attribute.value', 'search', [[['product_tmpl_id', '=', product_template_id], ['product_attribute_value_id', '=', attribute_id]]], {'limit':1})
if len(attributeValueIds) >0:
 attributeValueId = attributeValueIds[0]
...
set1 = models.execute_kw(db, uid, password, 'product.variant.combination', 'search_read', [[['product_template_attribute_value_id', '=', attributeValueId]]], {'field': ['product_product_id']})

And I got an error:
xmlrpc.client.Fault: product.variant.combination doesn't exist">

Is there anyone can help? Appreciate.