Perhaps you should try some spelling variations:
2c archaeometallurgy » 2.2 archaeometallurgy, _ archaeometallurgy, 1 archaeometallurgy
2c metal » c metal, ic metal, sc metal
a thesis » _ thesis
12 maldi » 16 maldi, 17 maldi, 2 maldi
20 maii » 20 mai, 30 maii, 25 maii
26 maii » 26 mai, 26 martii
2 maii » 25 maii, 28 maii, 29 maii

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: %22archaeology%_ metallurgy%((((12 maldi) OR (((2 maii) OR (20 maii))))) OR (26 maii))%a thesis%2c archaeometallurgy%2c metal%22.
• Adding a wildcard symbol may retrieve word variants: %22archaeology%_ metallurgy%((((12 maldi) or (((2 maii) or (20 maii))))) or (26 maii))%a thesis%2c archaeometallurgy%2c metal%22*.