Perhaps you should try some spelling variations:
"using hat cheo snippets" » "using sat cheo snippets", "using data cheo snippets", "using half cheo snippets", "using thuat cheo snippets", "using nham cheo snippets", "using nhat nheo snippets"
"dung java java snippets" » "dung va java snippets"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code snippets", "locating bug core 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: (((("using hat cheo snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("using hat cheo snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( using hat cheo snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("using hat cheo snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.