Perhaps you should try some spelling variations:
hanh trong » hanh trang, anh trong, hinh trong
duong cong » dung cong, luong cong, duong trong
hieu manh » chieu xanh, hieu nganh, dieu hanh
hieu lang » chieu sang, hieu quang, nhieu tang
trong dam » trong lam, trong nam, trong cac
dam duong » dai duong, dam dong, tam duong
van thanh » ban thanh, van tuan
dan toan » van toan, dan than, manh toan

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hieu manh) or (hieu lang)) - hanh trong dam duong cong ((dan toan) or (van thanh)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu manh) OR (hieu lang)) - hanh trong dam duong cong ((dan toan) OR (van thanh)) cau.
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu manh) or (hieu lang)) - hanh trong dam duong cong ((dan toan) or (van thanh)) cau*.