Perhaps you should try some spelling variations:
"dung thu canh snippets" » "dung thu code snippets", "ung thu canh snippets", "dung phu canh snippets", "dung thi canh snippets", "dung thuc hanh snippets", "dung thu cong snippets", "dung thu ban 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 thu canh snippets") or ("dung java java snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung thu canh snippets") OR ("dung java java snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( dung thu canh snippets ) or ( dung java java snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung thu canh snippets") or ("dung java java snippets"))) or ("locating bug core snippets"))*.