Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"phan thi can snippets" » "pham thi can snippets", "tran thi can snippets", "phan tu can snippets", "phan thi canh snippets", "phan thi lan 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 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: (((("phan thi can snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( phan thi can snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("phan thi can snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.