Perhaps you should try some spelling variations:
hien khanh » hien hanh, hien nhanh, dien khanh
chieu xanh » chieu sach, chieu sang, chieu tinh
hanh nang » anh nang, ganh nang, hanh mang
cao thong » cao thuong, tao thong, cao phong
cong hai » cong thai, hoang hai, cong tac
toan ban » van ban
cong ha » cong hoa, dong ha, cong tac

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

• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien khanh) OR (chieu xanh)) - hanh nang cao thong ((cong hai) OR (cong ha)) toan ban~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien khanh) or (chieu xanh)) - hanh nang cao thong ((cong hai) OR (cong ha)) toan ban~".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien khanh) or (chieu xanh)) - hanh nang cao thong ((cong hai) OR (cong ha)) toan ban*.