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