Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
van hanh » van thanh, ban hanh, van anh
hanh tri » thanh tri, hanh tai, hanh trinh
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
ha thuc » va thuc, ha thuy, ha thu
cua tre » cua te, cua triet, dua tren
cuu tre » cau tren, cau treo
ho duc » hoc duc, do duc, hong duc

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 ky nang xa hoi. hieu van ((ha thuc) OR (ho duc)) van hanh tri ((cua tre) OR (cuu tre))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang xa hoi. hieu van ((ha thuc) or (ho duc)) van hanh tri ((cua tre) OR (cuu tre))~".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang xa hoi. hieu van ((ha thuc) or (ho duc)) van hanh tri ((cua tre) OR (cuu tre))*.