Perhaps you should try some spelling variations:
"cong luong he snippets" » "cong thuong he snippets", "nang luong he snippets", "cong dong he snippets", "cong luong che snippets", "cong luong ha snippets", "cong luong ke 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: (((("cong luong he snippets") or ("hang java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("cong luong he snippets") OR ("hang java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( cong luong he snippets ) or ( hang java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("cong luong he snippets") or ("hang java java snippets"))) or ("locating bug code snippets"))*.