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