Perhaps you should try some spelling variations:
qua pham » quan pham, quy pham, qua cham
va thanh » gia thanh, ban thanh, va tinh
thanh va » thanh van, hanh va, thanh ha
dua tren » dung tren
su sach » so sach, vu sach
cua tre » cuu tre, cua triet, cua thep
y nang » ky nang, ly nang, v nang
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 y nang x hoi. hieu qua pham duc va thanh va ((((cua tre) OR (dua tren))) OR (cua te))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y nang x hoi. hieu qua pham duc va thanh va ((((cua tre) OR (dua tren))) or (cua te))~".
• Adding a wildcard symbol may retrieve word variants: su sach y nang x hoi. hieu qua pham duc va thanh va ((((cua tre) OR (dua tren))) or (cua te))*.