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