Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"cong khoi he snippets" » "cong khi he snippets", "cong nhoi he snippets", "tong khoi he snippets", "cong khoa he snippets", "cong khoi de snippets", "cong khong 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 khoi 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 khoi he snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( cong khoi he snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("cong khoi he snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.