Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"doc cua toan snippets" » "doc cuu toan snippets", "doc xuan toan snippets", "doc cua thanh snippets", "hoc cua toan snippets", "doi cua toan snippets", "do cua 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: (((("doc cua 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: (((("doc cua toan snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( doc cua toan snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("doc cua toan snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.