Perhaps you should try some spelling variations:
hieu nganh » vien nganh, hiem ngan, nghiep nganh
hanh trung » thanh trung, hanh trang, manh trung
khong cong » thong cong, khong cang, chong cong
hieu manh » chieu xanh, dieu hanh, hien hanh
trung cua » truong cua, trung tuan, trung cap
cua khong » hua khong, cua phuong, cua thuong
tap toan » tap doan, tap quan
bai toan » bai 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 ((hieu manh) or (hieu nganh)) - hanh trung cua khong cong ((tap toan) or (bai toan)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu manh) OR (hieu nganh)) - hanh trung cua khong cong ((tap toan) OR (bai toan)) cao.
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu manh) or (hieu nganh)) - hanh trung cua khong cong ((tap toan) or (bai toan)) cao*.