Perhaps you should try some spelling variations:
hieu lang » chieu sang, hieu quang, nhieu tang
trong bai » trong ban, thong bai, trong hai
mang vua » mang cua, hang va, bang va
ho hieu » ho chieu, hoi hieu, nho hieu
mang va » hang va, bang va, mang xa
dang va » dang van, dang vat, hang va
tap cao » tap co, tao cao, tap cac

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ho hieu lang - hanh ((((mang va) OR (dang va))) OR (mang vua)) dung trong bai tap cao~.
• Adding a wildcard symbol may retrieve word variants: ho hieu lang - hanh ((((mang va) or (dang va))) or (mang vua)) dung trong bai tap cao*.