Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"lan duc cong snippets" » "lan duc cuong snippets", "lan dung cong snippets", "lan nuoc cong snippets", "lang duc cong snippets", "van duc cong snippets", "lan dac cong 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: (((("lan duc cong snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("lan duc cong snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( lan duc cong snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("lan duc cong snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.