Perhaps you should try some spelling variations:
tan thanh » tran thanh, tang thanh, toan thanh
thanh vi » hanh vi, thanh va, thanh ve
su sach » so sach
vu sach » vu bach, vu khach
xang xa » lang xa, mang xa, ang xa
qua cac » cua cac
cac duc » cac du, cao duc, cac dac
cua tre » cuu tre, cua triet, dua tren
cua te » cua tu

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: ((su sach) OR (vu sach)) ty xang xa hoi. hieu qua cac duc tan thanh vi ((cua tre) OR (cua te))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (vu sach)) ty xang xa hoi. hieu qua cac duc tan thanh vi ((cua tre) or (cua te))~".
• Adding a wildcard symbol may retrieve word variants: ((su sach) OR (vu sach)) ty xang xa hoi. hieu qua cac duc tan thanh vi ((cua tre) or (cua te))*.