Perhaps you should try some spelling variations:
"dang thong cong snippets" » "dang thong code snippets", "dang thuong cong snippets", "dong thong cong snippets", "mang thong cong snippets", "dang trong cong snippets", "dang tong cong snippets", "dang thong thong snippets"
"locating bug core snippets" » "locating bug code snippets"
"dung java java snippets" » "dung va java 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: (((("dung java java snippets") or ("dang thong cong snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung java java snippets") OR ("dang thong cong snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( dung java java snippets ) or ( dang thong cong snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung java java snippets") or ("dang thong cong snippets"))) or ("locating bug core snippets"))*.