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
su sach » so sach, vu sach
sach ly » sach y, sach lo, sach ty
ly nang » ky nang, ly hang, ly vang
cua tre » cuu tre, cua triet, dua tren
cua te » cua tu
x hoi » o hoi, x ho, 5 hoi

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