Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"hau vien cac snippets" » "nhan vien cac snippets", "khau viet cac snippets", "thau dien cac snippets", "hau vien bach snippets", "hau vien dai snippets", "hau 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: (((("hau 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: (((("hau vien cac snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( hau vien cac snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("hau vien cac snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.