Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"mao can chen snippets" » "mao can chien snippets", "mao yan chen snippets", "mao can chan snippets", "mao van chen snippets", "mao con chen snippets", "mat can chen snippets"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code snippets", "locating bug core snippets"

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (((("mao can chen snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("mao can chen snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( mao can chen snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("mao can chen snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.