Perhaps you should try some spelling variations:
nhanh bang » nhanh lang, nhanh mang, nhanh quang
hieu xanh » chieu xanh, hieu nganh, dieu hanh
hieu manh » chieu xanh, hieu nganh, dieu hanh
dung cong » dung trong
ban than » ban thanh, van thanh, ban hang
bang va » hang va, ban va, trang va
va dung » van dung, va duong, vat dung

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: doc ((hieu xanh) OR (hieu manh)) - nhanh bang va dung cong ((xuan toan) or (ban than)) tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu xanh) OR (hieu manh)) - nhanh bang va dung cong ((xuan toan) OR (ban than)) tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((hieu xanh) OR (hieu manh)) - nhanh bang va dung cong ((xuan toan) or (ban than)) tap".
• Adding a wildcard symbol may retrieve word variants: doc ((hieu xanh) OR (hieu manh)) - nhanh bang va dung cong ((xuan toan) or (ban than)) tap*.