Perhaps you should try some spelling variations:
"truong anh co snippets" » "trong anh co snippets", "trung anh co snippets", "truong thanh co snippets", "truong anh so snippets", "truong danh cho snippets", "truong nganh co 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: (((("truong anh co snippets") or ("hang java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("truong anh co snippets") OR ("hang java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( truong anh co snippets ) or ( hang java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("truong anh co snippets") or ("hang java java snippets"))) or ("locating bug code snippets"))*.