Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"do dap toan snippets" » "do tap toan snippets", "do dan toan snippets", "do dap tan snippets", "doi dap toan snippets", "do dai toan snippets", "do dac toan 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: (((("do dap toan snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("do dap toan snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( do dap toan snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("do dap toan snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.