Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"duc phap doc snippets" » "duc phan doc snippets", "duc hau doc snippets", "hoc phap doc snippets", "duc phap hoc snippets", "duc phap coc snippets", "duc phap dot 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 phap doc 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 phap doc snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( duc phap doc snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("duc phap doc snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.