Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"cong mi he snippets" » "cong li he snippets", "cong ma he snippets", "cong ti he snippets", "cong moi he snippets", "cong gi he snippets", "cong vi he 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: (((("cong mi he snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("cong mi he snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( cong mi he snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("cong mi he snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.