Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"dat hieu mot snippets" » "dao hieu mot snippets", "dat tieu mot snippets", "rat nhieu mot snippets", "dat thieu mot snippets", "dat hieu moi snippets", "dat hieu 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: (((("dat hieu mot snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dat hieu mot snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dat hieu mot snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dat hieu mot snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.