Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"khi huy toan snippets" » "khi huy tran snippets", "khi huu toan snippets", "khi huy hoang snippets", "chi huy toan snippets", "thi thuy toan snippets", "khai hub 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: (((("khi huy 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: (((("khi huy toan snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( khi huy toan snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("khi huy toan snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.