Perhaps you should try some spelling variations:
2c archaeometallurgy » 2.2 archaeometallurgy, 1 archaeometallurgy, 10 archaeometallurgy
_ archaeometallurgy » _ archaeometallurgical
2c metallurgy » 27 metallurgy, 2 metallurgy, _ metallurgy
2c thesis » _ thesis, my thesis, i thesis
2 thesis » 2 thess, 2 theil, 2 themes
2c metal » c metal, ic metal, sc metal
2 maldi » 12 maldi, 27 maldi, _ 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%2c metallurgy%2 maldi%((((2c thesis) OR (2 thesis))) OR (a thesis))%((2c archaeometallurgy) OR (((_ archaeometallurgy) OR (archaeometallurgy _))))%2c metal%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22archaeology%2c metallurgy%2 maldi%((((2c thesis) OR (2 thesis))) or (a thesis))%((2c archaeometallurgy) or (((_ archaeometallurgy) or (archaeometallurgy _))))%2c metal%22".
• Adding a wildcard symbol may retrieve word variants: %22archaeology%2c metallurgy%2 maldi%((((2c thesis) OR (2 thesis))) or (a thesis))%((2c archaeometallurgy) or (((_ archaeometallurgy) or (archaeometallurgy _))))%2c metal%22*.