Perhaps you should try some spelling variations:
"dong san chat snippets" » "dong san code snippets", "cong san chat snippets", "dong bang chat snippets", "dong von chat snippets", "dong van chat snippets", "dong san chay snippets", "dong ban 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: (((("dong san 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: (((("dong san chat snippets") OR ("dung java java snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( dong san chat snippets ) or ( dung java java snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dong san chat snippets") or ("dung java java snippets"))) or ("locating bug core snippets"))*.