Perhaps you should try some spelling variations:
thanh nhan » thanh phan, thanh san, thanh toan
ban thanh » ban hanh, ban hang
hieu van » hieu va, thien van, lieu va
nam duoc » nam thuoc, da duoc, dat duoc
duoc ban » duc ban, quoc ban, buoc ban
nhan cua » nhat cua, nhan luc, nhan su
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
cua tre » cua te, cuu tre, cua triet
x hoi » xa hoi, 5 hoi
o hoi » co hoi, o hoc, o hai

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 ty nang ((((x hoi) OR (x ho))) or (o hoi)). hieu van nam duoc ban thanh nhan cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang ((((x hoi) OR (x ho))) OR (o hoi)). hieu van nam duoc ban thanh nhan cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty nang ((((x hoi) OR (x ho))) or (o hoi)). hieu van nam duoc ban thanh nhan cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach ty nang ((((x hoi) OR (x ho))) or (o hoi)). hieu van nam duoc ban thanh nhan cua tre*.