Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"van song da snippets" » "van dong da snippets", "van cong da snippets", "van son da snippets", "van song xa snippets", "van song va snippets", "van song cua 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 song da 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 song da snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van song da snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van song da snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.