Perhaps you should try some spelling variations:
"ca dan canh snippets" » "ca dan code snippets", "ca van canh snippets", "ca dan cach snippets", "ca dan hanh snippets", "cac dan canh snippets", "ca dao canh snippets"
"lochating bug core snippets" » "locating bug core snippets", "lochating bug code snippets"
"python using java snippets" » "python using data 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: (((("ca dan canh snippets") or ("python using java snippets"))) or ("lochating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("ca dan canh snippets") OR ("python using java snippets"))) OR ("lochating bug core snippets")).
• Removing quotes may allow a broader search: (((( ca dan canh snippets ) or ( python using java snippets ))) or ( lochating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("ca dan canh snippets") or ("python using java snippets"))) or ("lochating bug core snippets"))*.