Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"dan thi toan snippets" » "dan thi tran snippets", "dan thi hoan snippets", "dan thi loan snippets", "dang thi toan snippets", "tran thi toan snippets", "dinh thi 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: (((("dan thi 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: (((("dan thi toan snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dan thi toan snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dan thi toan snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.