Perhaps you should try some spelling variations:
"hoi dan toan snippets" » "hoi dan code snippets", "hoi van toan snippets", "hoi dan than snippets", "hoi manh toan snippets", "hoa dan toan snippets", "hoc dan toan snippets", "hoi dap toan 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 toan 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 toan snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( python using java snippets ) or ( hoi dan toan snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("python using java snippets") or ("hoi dan toan snippets"))) or ("locating bug core snippets"))*.