Perhaps you should try some spelling variations:
"truong dang toc snippets" » "trong dang toc snippets", "truong giang toc snippets", "truong quang toc snippets", "truong dan toc snippets", "truong dang thuoc snippets", "truong dang quoc 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: (((("truong dang toc snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("truong dang toc snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( truong dang toc snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("truong dang toc snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.