Perhaps you should try some spelling variations:
hieu manh » chieu xanh, hieu nganh, hien hanh
hanh tinh » hanh trinh, nhanh tinh, thanh tinh
tong dang » trong dang, truong dang, duong dang
tinh hoc » sinh hoc, tin hoc, hinh hoc
hoc tong » hoc trong, hoc thong, hoc cong
dang van » hoang van, hang va
van tuan » van quan, van ban, anh tuan
tuan cau » toan cau, quan cau, tuan cu

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 (dieu hanh)) - hanh tinh hoc tong dang van tuan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hieu manh) OR (dieu hanh)) - hanh tinh hoc tong dang van tuan cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu manh) OR (dieu hanh)) - hanh tinh hoc tong dang van tuan cau*.