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