Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"thi ba toan snippets" » "thi bai toan snippets", "thi bao toan snippets", "thi va toan snippets", "thi ha toan snippets", "thi ra toan snippets", "thi bach 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: (((("thi ba 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: (((("thi ba toan snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( thi ba toan snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("thi ba toan snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.