Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"lan dau cong snippets" » "lan cau cong snippets", "lan dai cong snippets", "lan dam cong snippets", "van dau cong snippets", "ban dau cong snippets", "han dau 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 dau 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 dau cong snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( lan dau cong snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("lan dau cong snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.