Perhaps you should try some spelling variations:
"trinh bo cong snippets" » "trinh bo code snippets", "trinh boi cong snippets", "trinh bao cong snippets", "trinh do cong snippets", "trinh so cong snippets", "trinh cao cong snippets", "trinh hoc cong 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 ("trinh bo 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 ("trinh bo cong snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( dung java java snippets ) or ( trinh bo cong snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung java java snippets") or ("trinh bo cong snippets"))) or ("locating bug core snippets"))*.