Perhaps you should try some spelling variations:
"cong vang chat snippets" » "cong vang code snippets", "cong lang chat snippets", "cong quang chat snippets", "cong ngang chat snippets", "cong van chat snippets", "cong van phat snippets", "cong va chat 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: (((("cong vang chat snippets") or ("dung java java snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("cong vang chat snippets") OR ("dung java java snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( cong vang chat snippets ) or ( dung java java snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("cong vang chat snippets") or ("dung java java snippets"))) or ("locating bug core snippets"))*.