Perhaps you should try some spelling variations:
duong manh » duong van
bang duong » bang suong, bang tuong, tang duong
hieu lang » chieu sang, hieu quang, nhieu tang
canh dinh » canh tinh, canh binh, canh dich
anh dinh » hanh dinh, lanh dinh, anh kinh
van bang » van ban, van nang, von bang
toan ban » van ban
ho hieu » ho chieu, hoi hieu, nho hieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho hieu lang - ((canh dinh) or (anh dinh)) van bang duong manh ((toan tap) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho hieu lang - ((canh dinh) OR (anh dinh)) van bang duong manh ((toan tap) OR (toan ban)).
• Adding a wildcard symbol may retrieve word variants: ho hieu lang - ((canh dinh) or (anh dinh)) van bang duong manh ((toan tap) or (toan ban))*.