Perhaps you should try some spelling variations:
"using hanh nghe snippets" » "song hanh nghe snippets", "using high nghe snippets", "using half nghe snippets", "using anh nghe snippets", "using van nghe snippets", "using lang nghe 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 hanh nghe 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 hanh nghe snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( using hanh nghe snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("using hanh nghe snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.