Perhaps you should try some spelling variations:
"nhung viec voi snippets" » "nhung dieu voi snippets", "nhung kien voi snippets", "hung viet voi snippets", "nhung viec cuoi snippets", "nhung viec va snippets", "nhung viec so 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: (((("nhung viec voi snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("nhung viec voi snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( nhung viec voi snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("nhung viec voi snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.