Perhaps you should try some spelling variations:
2c archaeometallurgy » 2.2 archaeometallurgy, _ archaeometallurgy, 1 archaeometallurgy
sic metal » c metal
2c thesis » _ thesis, a thesis, my thesis
2c metal » c metal, ic metal, wc metal
sc metal » c metal, ic metal, wc metal
2 thesis » 2 thess, 2 theil, 2 themes
2 maii » 26 maii, 20 maii, 25 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%((2c metal) OR (((sc metal) OR (sic metal))))lurgy%2 maii%((2c thesis) OR (2 thesis))%2c archaeometallurgy%((2c metal) OR (((sc metal) OR (sic metal))))%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22archaeology%((2c metal) or (((sc metal) OR (sic metal))))lurgy%2 maii%((2c thesis) or (2 thesis))%2c archaeometallurgy%((2c metal) or (((sc metal) OR (sic metal))))%22".
• Adding a wildcard symbol may retrieve word variants: %22archaeology%((2c metal) or (((sc metal) OR (sic metal))))lurgy%2 maii%((2c thesis) or (2 thesis))%2c archaeometallurgy%((2c metal) or (((sc metal) OR (sic metal))))%22*.