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