Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
qua pham » quan pham, quy pham, qua cham
thanh ha » thanh hoa, thanh hai, nhanh ha
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
duc van » duc va, duc tan, duc manh
cua tre » cuu tre, cua triet, dua tren
cua te » cua tu
x hoi » xa hoi, x ho, 5 hoi
o hoi » co hoi, o hoc, o hai

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