Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"che nin toan snippets" » "che tinh toan snippets", "che bien toan snippets", "che kinh toan snippets", "che hien toan 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: (((("che nin toan snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("che nin toan snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( che nin toan snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("che nin toan snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.