Perhaps you should try some spelling variations:
pduong thanh » phuong thanh, truong thanh, dong thanh
duong thanh » dong thanh, muong thanh, luong thanh
hien nhanh » thien thanh, tien thanh, dien thanh
hien hanh » dieu hanh
canh van » anh van, can van, cach van
cua dang » cua cong, cua ban
toan cao » toan ban, toan tap
van cua » vang cua, ban cua, dan cua

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 hanh) or (hien nhanh)) - canh van cua dang ((duong thanh) or (pduong thanh)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien hanh) OR (hien nhanh)) - canh van cua dang ((duong thanh) OR (pduong thanh)) toan cao.
• Adding a wildcard symbol may retrieve word variants: hoc ((hien hanh) or (hien nhanh)) - canh van cua dang ((duong thanh) or (pduong thanh)) toan cao*.