1) transaction does not exist => the viabtc node either didn't receive your transaction, or it was rejected by their node
2) Submissions are beyond limit. => if you read viaBTC's TOS, you'll see that they only accept 100 submissions each hour. The current hour's submission limit was reached... Try again in 14 minutes.
You are a little late on this, you should have checked the transactions first.
They already have 14 confirmations, that's why you cannot find them in the mempool.