Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"duc dan he snippets" » "duoc dan he snippets", "duc tan he snippets", "duc dai he snippets", "duc dan ve snippets", "duc dan de snippets", "duc dan ke 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: (((("duc dan he snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("duc dan he snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( duc dan he snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("duc dan he snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.