Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"van duc phe snippets" » "van duy phe snippets", "van du phe snippets", "tran duc phe snippets", "van duc pho snippets", "van duc phan snippets", "van duc nghe 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: (((("van duc phe snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("van duc phe snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van duc phe snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van duc phe snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.