Perhaps you should try some spelling variations:
"dong cac chat snippets" » "dong cac code snippets", "duong cac chat snippets", "dong bac chat snippets", "dung cac chat snippets", "dong cao chat snippets", "dong cac thuat snippets", "dong cac nha 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 cac 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 cac chat snippets") OR ("dung java java snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( dong cac chat snippets ) or ( dung java java snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dong cac chat snippets") or ("dung java java snippets"))) or ("locating bug core snippets"))*.