Perhaps you should try some spelling variations:
hanh trung » thanh trung, hanh trang, manh trung
chieu xanh » chieu sach, chieu sang, chieu tinh
thong cong » trong cong, tong cong, thong thong
hieu manh » hieu nganh, dieu hanh, hien hanh
trung cua » truong cua, trung tuan, trung cap
cua thong » cua thuong, cua khong, cua tong
tap toan » tap quan, bai toan
tap doan » tap quan

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 (chieu xanh)) - hanh trung cua thong cong ((tap toan) OR (tap doan)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu manh) OR (chieu xanh)) - hanh trung cua thong cong ((tap toan) OR (tap doan)) cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hieu manh) or (chieu xanh)) - hanh trung cua thong cong ((tap toan) OR (tap doan)) cao".
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu manh) or (chieu xanh)) - hanh trung cua thong cong ((tap toan) OR (tap doan)) cao*.