Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"tue nhan hoc snippets" » "cu nhan hoc snippets", "tue nha hoc snippets", "tue nhan hoa snippets", "tue than hoc 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: (((("tue nhan hoc snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("tue nhan hoc snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( tue nhan hoc snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("tue nhan hoc snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.