Perhaps you should try some spelling variations:
2.2 archaeometallurgy » _ archaeometallurgy, 1 archaeometallurgy, 10 archaeometallurgy
27 metallurgy » _ metallurgy
2c metal » c metal, ic metal, sc metal
26 maii » 26 martii
25 maii » 25 mai, 25 main, 15 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%27 metallurgy%((26 maii) OR (((25 maii) OR (26 mai))))%_ thesis%2.2 archaeometallurgy%2c metal%22.
• Adding a wildcard symbol may retrieve word variants: %22archaeology%27 metallurgy%((26 maii) or (((25 maii) or (26 mai))))%_ thesis%2.2 archaeometallurgy%2c metal%22*.