Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
thanh tung » thanh cong
hieu manh » chieu xanh, hieu nganh, dieu hanh
nong cong » cong cong, tong cong, nang cong
tac chuan » tac cua, tac can, tao thuan
tung tam » trung tam, vung tam, dung tam
tam nong » lam nong, tam duong, tam huong

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