Translation:The advertisements are available on the internet.
Yes rather. But it helps keep you aware that basically there is one pronunciation for each character and there are accents to help you along.
The prefix δια means: by the (by way of, across, through...)
plus > φήμη (fame, renown ...)
plus > θέση (place, position...)
plus > δίκτυο (net, network...)
And of course English: via by way of.