Perhaps you should try some spelling variations:
"lan trinh chat snippets" » "lan trinh code snippets", "lan tinh chat snippets", "lan trinh luat snippets", "lan trinh han snippets", "lap trinh chat snippets", "dan trinh chat snippets", "lan tranh 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: (((("lan trinh 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: (((("lan trinh chat snippets") OR ("dung java java snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( lan trinh chat snippets ) or ( dung java java snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("lan trinh chat snippets") or ("dung java java snippets"))) or ("locating bug core snippets"))*.