Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"qua toan cau snippets" » "cua toan cau snippets", "qua tan cau snippets", "qua than cau snippets", "qua toan cao snippets", "qua toan ban snippets", "qua toan tap 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: (((("qua toan cau snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("qua toan cau snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( qua toan cau snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("qua toan cau snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.