Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"van duong da snippets" » "van dong da snippets", "van dung da snippets", "van phong da snippets", "van duong dao snippets", "van duong dai snippets", "van duong dan 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 duong 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 duong da snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van duong da snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van duong da snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.