Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
van doanh » toan doanh, van dong, van anh
su sach » so sach, vu sach
co sach » bo sach, cuon sach, hoc sach
ky dang » ky nang, ky danh
dang xa » dang xay, lang xa, dang ha
dau luc » cau luc, dau luan, dau nuoc
cua tre » cua te, cuu tre, cua triet
va dau » va dao
va cua » va chua, via cua, ca cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) or (co sach)) ky dang xa hoi. lieu va dau luc ((van doanh) or (van thanh)) va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (co sach)) ky dang xa hoi. lieu va dau luc ((van doanh) OR (van thanh)) va cua tre.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (co sach)) ky dang xa hoi. lieu va dau luc ((van doanh) or (van thanh)) va cua tre*.