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