This is the 6329th most frequent Dutch word.
stienen
"Stienen" is not a standard Dutch word; it may be a surname or a typo.
In this sentence, 'stienen' is used as a noun in plural form, meaning 'stones' in English.
De oude muur is gemaakt van stienen.
The old wall is made of stones.
Here, 'stienen' appears to be used as a verb, meaning 'to place or position carefully' (although 'stienen' as a verb is not standard Dutch, it might be dialectical or hypothetical).
Hij stienen voorzichtig de dorre bladeren in de tuin.
He places cautiously the dry leaves in the garden.
In this sentence, 'stienen' seems to communicatively describe an action attributed to stones, although this verb form is unconventional and context-dependent.