Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"xuan duc can snippets" » "tran duc can snippets", "phan duc can snippets", "xuan huy can snippets", "xuan duc tan snippets", "xuan duy can snippets", "xuan duc van 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 duc can 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 duc can snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( xuan duc can snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("xuan duc can snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.