Perhaps you should try some spelling variations:
hieu xanh » chieu xanh, hieu manh, hieu nganh
nam thanh » pham thanh, ban thanh, tai thanh
doc hieu » toc thieu, hoc thieu, hoc hien
cach ung » cach dung, cac ung, cach chung
ung cong » dung cong, luong cong, duong cong
nam toan » nam tan, tam toan, nam thang
phong » thong

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 - khanh phong cach ung cong ((nam toan) OR (nam thanh)) cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu xanh - khanh phong cach ung cong ((nam toan) OR (nam thanh)) cau".
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - khanh phong cach ung cong ((nam toan) OR (nam thanh)) cau*.