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