Perhaps you should try some spelling variations:
hieu nganh » vien nganh, hiem ngan, nghiep nganh
chieu sach » chinh sach, chiet tach, chieu sang
nhung cong » dung cong, thong cong, hang cong
hieu manh » chieu xanh, dieu hanh, hien hanh
cua nhung » va nhung
canh ban » can ban, canh dan, canh van
cong san » cong tac
san toan » van toan, dan toan, manh toan
toan cau » toan cao, toan ban, toan tap
ban cua » ban quan

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

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