Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
qua pham » quan pham, quy pham, qua cham
thanh va » thanh van, hanh va, thanh ha
su sach » vu sach
so sach » so sanh, bo sach, co sach
duc van » duc va, duc tan, duc manh
cua tre » cuu tre, cua triet, dua tren
cua te » cua tu
x hoi » xa hoi, o hoi, x ho

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 (so sach)) ky nang x hoi. hieu qua pham duc van thanh va ((cua tre) OR (cua te))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (so sach)) ky nang x hoi. hieu qua pham duc van thanh va ((cua tre) or (cua te))~".
• Adding a wildcard symbol may retrieve word variants: ((su sach) OR (so sach)) ky nang x hoi. hieu qua pham duc van thanh va ((cua tre) or (cua te))*.