Currently I have:
- 23 Indonesian resources
- 2 Norwegian resources
- 2 Swahili resources
I want to make a collection that contains all these resources. Apparently the following searches returned all 27 resources:
- "language:Indonesian OR language:Norwegian OR language:Swahili"
- "language:(Indonesian, Norwegian, Swahili)"
However, I tried a few other searches, with quite surprising results.
So I tried:
1) "language:(Indonesian OR Norwegian OR Swahili)" --> 6 hits; even an English resource!
2) "language:{Indonesian OR Norwegian OR Swahili}" --> 0 hits
3) "language:(Indonesian OR Norwegian OR Swahili}" --> 32 hits (also some English)
4) "language:{Indonesian OR Norwegian OR Swahili)" --> 32 hits (also some English)
Can someone explain to me what's the effect of (), {}, (}, {), and OR in a search list?