Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"thu khi toan snippets" » "thu chi toan snippets", "thu ke toan snippets", "thu bai toan snippets", "thuy khi toan snippets", "thu phoi 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: (((("thu khi 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: (((("thu khi toan snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( thu khi toan snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("thu khi toan snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.