Perhaps you should try some spelling variations:
nhanh dung » nhanh dong, hanh dung, nhanh hung
hoac khong » hoa khong, hoc khong, hay khong
khong cong » thong cong, khong cang, chong cong
hieu xanh » chieu xanh, hieu manh, hieu nganh
dung hoac » dung hoc, dung hoa, dung hoai
doc hieu » toc thieu, hoc thieu, hoc hien
dan than » dan chan, ban than, van than

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 - nhanh dung hoac khong cong ((xuan toan) or (dan than)) tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu xanh - nhanh dung hoac khong cong ((xuan toan) OR (dan than)) tap.
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - nhanh dung hoac khong cong ((xuan toan) or (dan than)) tap*.