Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"vien cac doi snippets" » "vien bach doi snippets", "vien dai doi snippets", "vien da doi snippets", "vien cac dai snippets", "vien cac toi snippets", "vien cau doi 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: (((("vien cac doi snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("vien cac doi snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( vien cac doi snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("vien cac doi snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.