Perhaps you should try some spelling variations:
27 metallurgy » _ metallurgy
2c thesis » 2 thesis, a thesis, my thesis
12 maldi » 16 maldi, 17 maldi, _ maldi
2c metal » c metal, ic metal, sc metal
2 maldi » 27 maldi, _ maldi, a maldi

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%((2 maldi) OR (12 maldi))%((2c thesis) OR (_ thesis))%_ archaeometallurgy%2c metal%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22archaeology%27 metallurgy%((2 maldi) OR (12 maldi))%((2c thesis) or (_ thesis))%_ archaeometallurgy%2c metal%22".
• Adding a wildcard symbol may retrieve word variants: %22archaeology%27 metallurgy%((2 maldi) OR (12 maldi))%((2c thesis) or (_ thesis))%_ archaeometallurgy%2c metal%22*.