It can be seen that: có thể thấy (rằng)

Có thể thấy means "it can be seen that". It opens a sentence in which the writer draws a conclusion from what came before: Có thể thấy, mạng xã hội đã thay đổi cách sinh viên tìm kiếm thông tin (it can be seen that social media has changed the way students look for information). There's no subject: the seeing belongs to writer and reader together. A comma, rằng or nothing follows.

It belongs to university papers and theses, typically right after a table, a set of figures or a review of earlier studies, and in conclusions. A short phrase in front often says where the conclusion comes from: Từ kết quả trên, có thể thấy … (from the results above, …), Qua bảng 3, có thể thấy … (from Table 3, …). News uses it rarely, mostly in commentary.

Có thể nói (rằng) (one could say) is close, but it offers a judgement or a summary rather than a reading of data: Có thể nói, đây là bước ngoặt của ngành (one could say this is a turning point for the industry).

Compare cho thấy (shows), where the data is the subject and does the showing: Bảng 3 cho thấy …. The two don't mix, because a table can't "see".

In speech, people say thấy là … or vậy là … (so, that means): Vậy là ai cũng thích.