Perhaps you should try some spelling variations:
"toc chieu cao snippets" » "toc thieu cao snippets", "doc hieu cao snippets", "hoc thieu cao snippets", "toc hieu cac snippets", "toc hieu ca snippets", "toc chieu day snippets"
"dung java java snippets" » "dung va java 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: (((("toc chieu cao snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("toc chieu cao snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( toc chieu cao snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("toc chieu cao snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.