Perhaps you should try some spelling variations:
thanh trinh » hanh trinh, thanh tinh, thanh binh
vu thanh » su thanh, vu khanh, cuu thanh
trinh do » trinh ky
hoc sach » hoc sinh, hoc cac, hoc anh
sach han » sach tham, sach danh, sach nang
do khi » doi khi, do thi, bo khi
han co » phan co, han cho, nhan co

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: (( vu thanh trinh do khi đong luc ) OR ( hoc sach han co khi đong luc ))~.
• Adding a wildcard symbol may retrieve word variants: (( vu thanh trinh do khi đong luc ) or ( hoc sach han co khi đong luc ))*.