Perhaps you should try some spelling variations:
"dung dan cach snippets" » "dung dan code snippets", "dung dat cach snippets", "dung san cach snippets", "tung dan cach snippets", "dung dan cac snippets", "dung dan canh snippets", "dung nhan cach snippets"
"locating bug core snippets" » "locating bug code snippets"
"hang java java snippets" » "hang 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 dan cach snippets") or ("hang java java snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung dan cach snippets") OR ("hang java java snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( dung dan cach snippets ) or ( hang java java snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung dan cach snippets") or ("hang java java snippets"))) or ("locating bug core snippets"))*.