Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"phan thi don snippets" » "pham thi don snippets", "tran thi don snippets", "phan tu don snippets", "phan thi doan snippets", "phan thi dong snippets", "phan thi dan 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: (((("phan thi don snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("phan thi don snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( phan thi don snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("phan thi don snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.