Perhaps you should try some spelling variations:
nhung cong » thong cong, hang cong, nhung don
chieu xanh » chieu sach, chieu sang, chieu tinh
hoc chieu » hoc thieu, ho chieu, hoc hien
hanh hinh » hanh chinh, hanh tinh, hanh dinh
dung cong » dung trong
hinh cua » chinh cua, sinh cua, tinh cua
dan toan » van toan, dan than, manh 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 chieu xanh - hanh hinh cua ((nhung cong) or (dung cong)) dan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chieu xanh - hanh hinh cua ((nhung cong) OR (dung cong)) dan toan cao.
• Adding a wildcard symbol may retrieve word variants: hoc chieu xanh - hanh hinh cua ((nhung cong) or (dung cong)) dan toan cao*.