Perhaps you should try some spelling variations:
2c archaeometallurgy » 2.2 archaeometallurgy, 1 archaeometallurgy, 10 archaeometallurgy
_ archaeometallurgy » _ archaeometallurgical, archaeometallurgy _
2c metal » ic metal, sc metal, wc metal
a thesis » _ thesis
25 maii » 25 mai, 25 main, 26 maii
2 maldi » 12 maldi, 27 maldi, _ maldi
c metal » sic metal, c methyl
2 maii » 26 maii, 20 maii, 28 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%_ metallurgy%((((2 maldi) OR (2 maii))) OR (25 maii))%a thesis%((2c archaeometallurgy) OR (_ archaeometallurgy))%((2c metal) OR (c metal))%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22archaeology%_ metallurgy%((((2 maldi) or (2 maii))) or (25 maii))%a thesis%((2c archaeometallurgy) or (_ archaeometallurgy))%((2c metal) OR (c metal))%22".
• Adding a wildcard symbol may retrieve word variants: %22archaeology%_ metallurgy%((((2 maldi) or (2 maii))) or (25 maii))%a thesis%((2c archaeometallurgy) or (_ archaeometallurgy))%((2c metal) OR (c metal))%22*.