Perhaps you should try some spelling variations:
van thanh » van tuan
sach thuc » cach thuc, sach thu, sach thue
ban thanh » ban hanh, ban hang
toc sach » hoc sach, doc sach, thuoc sach
hieu van » hieu va, thien van, lieu va
van chat » cao chat
chat huu » pham huu
dieu cua » dieu tra
hanh xa » hanh va, hanh ma, hanh xu
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach thuc hanh xa hoi. hieu van chat huu ((van thanh) or (ban thanh)) dieu cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach thuc hanh xa hoi. hieu van chat huu ((van thanh) OR (ban thanh)) dieu cua tre.
• Adding a wildcard symbol may retrieve word variants: toc sach thuc hanh xa hoi. hieu van chat huu ((van thanh) or (ban thanh)) dieu cua tre*.