Perhaps you should try some spelling variations:
hien nhanh » hien hanh, thien thanh, tien thanh
anh quang » anh xquang, anh quan, nhanh quang
quang cua » quan cua, quang tuan, quang huy
dung cong » dung trong
cong vang » cong lang, cong quang, cong ngang
vang toan » van toan, dang toan, quang toan
cua dung » cua dang, cua dong, qua dung
toan ban » van ban

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 (hien nhanh)) - anh quang cua dung cong vang toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((dieu hanh) OR (hien nhanh)) - anh quang cua dung cong vang toan ban.
• Adding a wildcard symbol may retrieve word variants: hoc ((dieu hanh) or (hien nhanh)) - anh quang cua dung cong vang toan ban*.