Perhaps you should try some spelling variations:
26 personnel » 22 personnel, 24 personnel, 6 personnel
20 personnel » _ personnel, du personnel, 7 personnel
29 personnel » _ personnel, du personnel, 7 personnel
26 economic » 2.6 economic, 16 economic, 36 economic
2 personnel » _ personnel, du personnel, 2 personal
a personnel » _ personnel, du personnel, care personnel
2f human » 20 human, 22 human, 2.2 human
21 human » 1 human, 11 human

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: %22business %((26 economic) OR (6 economic)) %((2f human) OR (21 human)) resources %((((26 personnel) OR (((((20 personnel) OR (2 personnel))) OR (29 personnel))))) OR (a personnel)) management%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22business %((26 economic) or (6 economic)) %((2f human) or (21 human)) resources %((((26 personnel) or (((((20 personnel) OR (2 personnel))) or (29 personnel))))) or (a personnel)) management%22".
• Adding a wildcard symbol may retrieve word variants: %22business %((26 economic) or (6 economic)) %((2f human) or (21 human)) resources %((((26 personnel) or (((((20 personnel) OR (2 personnel))) or (29 personnel))))) or (a personnel)) management%22*.