Perhaps you should try some spelling variations:
"using dan cho snippets" » "using data cho snippets", "using a cho snippets", "using raw cho snippets", "using danh cho snippets", "using san cho snippets", "using dac cho snippets"
"hang java java snippets" » "hang 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 dan cho snippets") or ("hang java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("using dan cho snippets") OR ("hang java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( using dan cho snippets ) or ( hang java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("using dan cho snippets") or ("hang java java snippets"))) or ("locating bug code snippets"))*.