Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"van van hoai snippets" » "van van thoai snippets", "van van hoa snippets", "van van hai snippets", "van ban hoai snippets", "tan van hoai snippets", "san van hoai 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 van hoai 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 van hoai snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van van hoai snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van van hoai snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.