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