Perhaps you should try some spelling variations:
"hang cau chat snippets" » "hang cau code snippets", "hang dau chat snippets", "hang ca chat snippets", "nhung cau chat snippets", "hang cao chat snippets", "hang cau hat snippets", "hang cac 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: (((("hang cau 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: (((("hang cau chat snippets") OR ("dung java java snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( hang cau chat snippets ) or ( dung java java snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("hang cau chat snippets") or ("dung java java snippets"))) or ("locating bug core snippets"))*.