Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"xuan tran he snippets" » "xuan trang he snippets", "xuan toan he snippets", "xuan tan he snippets", "xuan tran hien snippets", "xuan tran hiep 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 tran he 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 tran he snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( xuan tran he snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("xuan tran he snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.