Perhaps you should try some spelling variations:
duong trong » dung trong
hanh trong » hanh trang, anh trong, hinh trong
hien sach » dien sach, kien sach, thien hach
hien hanh » dieu hanh
cac duong » cau duong, cac tuong, cac dong
tan toan » tan tran, tap toan, dan toan
van toan » van tuan, van tan, van thanh

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hien sach) or (hien hanh)) - hanh trong cac duong trong ((tan toan) or (van toan)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien sach) OR (hien hanh)) - hanh trong cac duong trong ((tan toan) OR (van toan)) cao.
• Adding a wildcard symbol may retrieve word variants: hoc ((hien sach) or (hien hanh)) - hanh trong cac duong trong ((tan toan) or (van toan)) cao*.