Perhaps you should try some spelling variations:
c metallurgy » _ metallurgy, 4 metallurgy, v metallurgy
a thesis » _ thesis
27 maldi » 17 maldi, 7 maldi, _ maldi
20 maii » 20 mai, 30 maii, 26 maii
25 maii » 25 mai, 25 main, 26 maii
2 maldi » 12 maldi, _ maldi, a maldi
c metal » sic metal, c methyl
2 maii » 26 maii, 28 maii, 29 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%c metallurgy%((((((2 maldi) OR (27 maldi))) OR (((2 maii) OR (20 maii))))) OR (25 maii))%a thesis%_ archaeometallurgy%c metal%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22archaeology%c metallurgy%((((((2 maldi) or (27 maldi))) or (((2 maii) OR (20 maii))))) or (25 maii))%a thesis%_ archaeometallurgy%c metal%22".
• Adding a wildcard symbol may retrieve word variants: %22archaeology%c metallurgy%((((((2 maldi) or (27 maldi))) or (((2 maii) OR (20 maii))))) or (25 maii))%a thesis%_ archaeometallurgy%c metal%22*.