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