Perhaps you should try some spelling variations:
hieu nganh » vien nganh, hiem ngan, hieu manh
hanh trang » thanh trung, canh tranh, hanh trinh
hien hanh » dieu hanh
trang cua » tranh cua, tang cua, trung cua
cua thong » cua thuong, cua khong, cua tong
thong tap » thong cap, tong tap, thong tai
tap toan » tap doan, tap quan, bai toan
toan cao » toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hien hanh) or (hieu nganh)) - hanh trang cua thong thong tap toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien hanh) OR (hieu nganh)) - hanh trang cua thong thong tap toan cao.
• Adding a wildcard symbol may retrieve word variants: hoc ((hien hanh) or (hieu nganh)) - hanh trang cua thong thong tap toan cao*.