Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"duy tan doc snippets" » "duy tuan doc snippets", "duc tan doc snippets", "duy van doc snippets", "duy than doc snippets", "duy tan duoc snippets", "duy tan dac 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: (((("duy tan 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: (((("duy tan doc snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( duy tan doc snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("duy tan doc snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.