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.
I didn't know the txid, the person asking the question hijacked the OP's thread

Time for my new beta tool
https://www.mocacinno.com/showchain.php?txid=7e295d281ed76d6d4db58a8c160c747bcfdaaee1f7f65dc546266a918e52ce3cYour transaction is using outputs from an unconfirmed transaction... As a matter of fact, if you look at the link i posted ^^ you'll see the list of all transactions that have to be confirmed before yours can be confirmed (they can all be added to the same block though, the only thing is that your transaction cannot be added to a block before the others have).
The problem with such a chain of unconfirmed transactions is that if a node rejects one of the transactions your transaction depends on, or if a node just doesn't receive one of the transactions in the list, or if he receives the transactions in the wrong order, this node will also reject your transaction since it's using the output of the depending transaction...