Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"van ngay doc snippets" » "tan ngay doc snippets", "van nga doc snippets", "va ngay doc snippets", "van ngay do snippets", "van ngay moi snippets", "van ngay de 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 ngay 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: (((("van ngay doc snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van ngay doc snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van ngay doc snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.