Perhaps you should try some spelling variations:
hieu nganh » vien nganh, hiem ngan, hieu manh
chieu sang » chieu sach, chieu xanh, hieu lang
hanh trung » thanh trung, hanh trang, manh trung
nhung cong » dung cong, hang cong, nhung don
thong cong » trong cong, tong cong, thong thong
trung cua » truong cua, trung tuan, trung cap
manh toan » thanh toan, anh tuan, tinh 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 ((hieu nganh) or (chieu sang)) - hanh trung cua ((nhung cong) OR (thong cong)) manh toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu nganh) OR (chieu sang)) - hanh trung cua ((nhung cong) OR (thong cong)) manh toan cao*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hieu nganh) or (chieu sang)) - hanh trung cua ((nhung cong) OR (thong cong)) manh toan cao*".