Searching with Text containing dash (-) will not return any result unless type in full

Summary

Searching with Text containing dash ( - ) with a space in front or two dashes after will not return any result.

Testing

Actual String in Summary	Search String	Return any result?
AAA - BBB	AAA - BBB
AAA -BBB	AAA -BBB
AAA-BBB	AAA-BBB
AAA- BBB	AAA- BBB
AAA-	AAA
AAA-B	AAA-
AAA-BBB-CCC	AAA-BBB-C
AAA-BBB-CCC	AAA-BBB-C*

Notes

It would appear that if there is an empty space in front of the search string, it will not return any results.