Intitle: lama returns nothing. Yet a Search for "lama" on the same idwiki will show that
there are a hundreds pages with the term lama in the title.

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