Perhaps you should try some spelling variations:
"dung soat chat snippets" » "dung dat chat snippets", "dung sai chat snippets", "dung san chat snippets", "dung hoat chat snippets", "dung sat chat snippets", "dung suat chat 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: (((("dung soat chat snippets") or ("hang java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung soat chat snippets") OR ("hang java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung soat chat snippets ) or ( hang java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung soat chat snippets") or ("hang java java snippets"))) or ("locating bug code snippets"))*.