Perhaps you should try some spelling variations:
hieu nganh » vien nganh, hiem ngan, hieu manh
nhung cong » dung cong, thong cong, hang cong
canh tinh » hanh tinh, manh tinh, canh tranh
cong sat » cong suat, cong san, cong hat
nhan cau » nhanh cau, phan cau, nhin cau
nhan sau » nhan su, nhan san, nhanh cau
tinh va » tich va, trinh van, trinh vat

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((dieu hanh) or (hieu nganh)) - canh tinh va nhung cong sat ((nhan cau) OR (nhan sau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((dieu hanh) OR (hieu nganh)) - canh tinh va nhung cong sat ((nhan cau) OR (nhan sau)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((dieu hanh) or (hieu nganh)) - canh tinh va nhung cong sat ((nhan cau) OR (nhan sau))".
• Adding a wildcard symbol may retrieve word variants: hoc ((dieu hanh) or (hieu nganh)) - canh tinh va nhung cong sat ((nhan cau) OR (nhan sau))*.