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

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