Perhaps you should try some spelling variations:
chuong chua » huong cua, chung cua, cong chua
chung chuan » chung khoan, chung cua, chung nhan
hieu nganh » vien nganh, hiem ngan, nghiep nganh
thong cong » trong cong, tong cong, thong thong
hieu manh » chieu xanh, dieu hanh, hien hanh
cong dan » cong san, cong tan, huong dan
dan chan » dan gian, dan ca, van chat
chan cau » phan cau, can cau, chinh cau

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 manh) OR (hieu nganh)) - thanh ((chuong chua) or (chung chuan)) thong cong dan chan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu manh) OR (hieu nganh)) - thanh ((chuong chua) OR (chung chuan)) thong cong dan chan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((hieu manh) OR (hieu nganh)) - thanh ((chuong chua) or (chung chuan)) thong cong dan chan cau".
• Adding a wildcard symbol may retrieve word variants: doc ((hieu manh) OR (hieu nganh)) - thanh ((chuong chua) or (chung chuan)) thong cong dan chan cau*.