Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"van tin den snippets" » "van tien den snippets", "van tan den snippets", "van thinh den snippets", "van tin don snippets", "van trinh den snippets", "van tin dung 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 tin den 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 tin den snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van tin den snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van tin den snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.