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