Perhaps you should try some spelling variations:
thanh trong » thanh trung, tranh trong, hanh trong
hien sach » dien sach, kien sach, thien hach
hien hanh » dieu hanh
cac duong » cau duong, cac tuong, cac dong
trong tan » trong quan, trong ca, trong thu
cong tan » cong tac, cong san, cong 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 ((hien sach) or (hien hanh)) - thanh trong cac duong ((trong tan) OR (cong tan)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien sach) OR (hien hanh)) - thanh trong cac duong ((trong tan) OR (cong tan)) toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien sach) or (hien hanh)) - thanh trong cac duong ((trong tan) OR (cong tan)) toan cao".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien sach) or (hien hanh)) - thanh trong cac duong ((trong tan) OR (cong tan)) toan cao*.