The problem seems to be
- only the intitle search parameter, but not others: incategory: lama
- only the term lama, but not others: intitle: "lama tibet", intitle: tibet prefix:lama, intitle: aceh prefix:lama
- only on idwiki, but not others: intitle:lama on mswiki, intitle:lama on enwiki
In Indonesian language, "lama" means "old", so it's definitely not a stopword.
I've tried several different URLs, and several different pages.
The following eight titles from prefix:Lama:
- Lama Tuha, Kuala Batee, Aceh Barat Daya * (intitle: aceh prefix:lama)
- Lama Mocogno
- Lama (Tibet)
- Lama, Pancur Batu, Deli Serdang
- Lama Tuha, Kuala Batee, Aceh Barat Daya
- Lama, Sei Lepan, Langkat
- Lama Baru, Sei Lepan, Langkat
- Lama parkir