Perhaps you should try some spelling variations:
hieu nganh » vien nganh, hiem ngan, nghiep nganh
chieu sach » chinh sach, chiet tach, chieu sang
thanh tung » thanh cong
hieu manh » chieu xanh, dieu hanh, hien hanh
tong cong » trong cong, cong cong, dung cong
tac chuan » tac quan, tac cua, tac can
chuan cau » chuan chau, chua cau, chuan chat
tung tam » trung tam, vung tam, dung tam
tam tong » tai tong, tam nong, tam song
cong tac » cong ty

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho ((((hieu manh) OR (hieu nganh))) or (chieu sach)) - thanh tung tam tong cong tac chuan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((((hieu manh) OR (hieu nganh))) OR (chieu sach)) - thanh tung tam tong cong tac chuan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((((hieu manh) OR (hieu nganh))) or (chieu sach)) - thanh tung tam tong cong tac chuan cau".
• Adding a wildcard symbol may retrieve word variants: ho ((((hieu manh) OR (hieu nganh))) or (chieu sach)) - thanh tung tam tong cong tac chuan cau*.