Perhaps you should try some spelling variations:
"cong duc chat snippets" » "cong duc code snippets", "cong suc chat snippets", "hong duc chat snippets", "cong dac chat snippets", "cong duoc chat snippets", "cong doc chat snippets", "cong du 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: (((("cong duc 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: (((("cong duc chat snippets") OR ("dung java java snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( cong duc chat snippets ) or ( dung java java snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("cong duc chat snippets") or ("dung java java snippets"))) or ("locating bug core snippets"))*.