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