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