Perhaps you should try some spelling variations:
"trinh doc chat snippets" » "trinh doc code snippets", "trinh do chat snippets", "trinh hoa chat snippets", "trinh co chat snippets", "trinh hoc chat snippets", "trinh toc cham snippets", "trinh hop 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: (((("trinh doc 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: (((("trinh doc chat snippets") OR ("dung java java snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( trinh doc chat snippets ) or ( dung java java snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("trinh doc chat snippets") or ("dung java java snippets"))) or ("locating bug core snippets"))*.