Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"den cong son snippets" » "dien cong son snippets", "den dong son snippets", "len cong son snippets", "den cong san snippets", "den cong so 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: (((("den cong son snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("den cong son snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( den cong son snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("den cong son snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.