Perhaps you should try some spelling variations:
chieu sang » chieu sach, chieu xanh, hieu lang
hanh trung » thanh trung, hanh trang, manh trung
trung vap » trung cap, trung va, trung van
dung cong » dung trong
tong cong » trong cong, cong cong, dang cong
van toan » van tuan, van tan, van thanh
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 ((dieu hanh) or (chieu sang)) - hanh trung vap ((dung cong) or (tong cong)) van toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((dieu hanh) OR (chieu sang)) - hanh trung vap ((dung cong) OR (tong cong)) van toan cao.
• Adding a wildcard symbol may retrieve word variants: hoc ((dieu hanh) or (chieu sang)) - hanh trung vap ((dung cong) or (tong cong)) van toan cao*.