Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"van hac toi snippets" » "van hoc toi snippets", "van ha toi snippets", "van hai toi snippets", "van cac toi snippets", "van khac tuoi snippets", "van cac thoi 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 hac toi 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 hac toi snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van hac toi snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van hac toi snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.