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