Perhaps you should try some spelling variations:
"hoc duoc cach snippets" » "hoc duoc code snippets", "hoc cuoc cach snippets", "hoc duoc cac snippets", "hoc truoc cach snippets", "hoc nuoc cach snippets", "hoa duoc cach snippets", "hoc dung cach 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: (((("hoc duoc cach snippets") or ("dung java java snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("hoc duoc cach snippets") OR ("dung java java snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( hoc duoc cach snippets ) or ( dung java java snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("hoc duoc cach snippets") or ("dung java java snippets"))) or ("locating bug core snippets"))*.