Perhaps you should try some spelling variations:
2c archaeometallurgy » 2.2 archaeometallurgy, _ archaeometallurgy, 1 archaeometallurgy
2c metallurgy » 27 metallurgy, 2 metallurgy, _ metallurgy
2c thesis » 2 thesis, a thesis, my thesis
27 maldi » 17 maldi, 2 maldi, 7 maldi
2c metal » c metal, ic metal, sc metal

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%2c metallurgy%27 maldi%((2c thesis) OR (_ thesis))%2c archaeometallurgy%2c metal%22.
• Adding a wildcard symbol may retrieve word variants: %22archaeology%2c metallurgy%27 maldi%((2c thesis) or (_ thesis))%2c archaeometallurgy%2c metal%22*.