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