Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"van sung den snippets" » "van dung den snippets", "van hung den snippets", "van duong den snippets", "van huong den snippets", "van tuong den snippets", "van cuong den 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 sung 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 sung den snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van sung den snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van sung den snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.