Perhaps you should try some spelling variations:
"hang cau cong snippets" » "hang cau code snippets", "hang dau cong snippets", "hang ca cong snippets", "nhung cau cong snippets", "hang cac cong snippets", "hang cuu cong snippets", "hang cao cong 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 java java snippets") or ("hang cau cong snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung java java snippets") OR ("hang cau cong snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( dung java java snippets ) or ( hang cau cong snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung java java snippets") or ("hang cau cong snippets"))) or ("locating bug core snippets"))*.