Perhaps you should try some spelling variations:
"dong thuc cham snippets" » "dong thuoc cham snippets", "duong thuc cham snippets", "cong thuc cham snippets", "dong thuc pham snippets", "dong phuc cham snippets", "dong thuc chan 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: (((("dong thuc cham snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dong thuc cham snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dong thuc cham snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dong thuc cham snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.