Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"khoa tre cao snippets" » "khoe tre cao snippets", "khoa tri cao snippets", "khoa dr cao snippets", "khoa te cao snippets", "khoa tre can snippets", "khoa tren cay 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: (((("khoa tre cao snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("khoa tre cao snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( khoa tre cao snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("khoa tre cao snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.