Perhaps you should try some spelling variations:
"phuong van hoe snippets" » "phung van hoe snippets", "phong van hoe snippets", "phuong lan hoe snippets", "phuong van hoa snippets", "phuong van hoc snippets", "phuong van hieu snippets"
"dung java java snippets" » "dung 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: (((("phuong van hoe snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("phuong van hoe snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( phuong van hoe snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("phuong van hoe snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.