Perhaps you should try some spelling variations:
thanh phan » thanh pho, thanh san, thanh toan
ban thanh » ban hanh, ban hang
hieu van » hieu va, thien van, lieu va
phan cua » nhan cua, than cua, phat cua
su sach » so sach, vu sach
sach tu » sach thu, cach tu, sach ty
tu nang » tru nang, tu nong, tu nano
van lam » van nam
lam duc » lam duoc, pham duc, nam duoc
duc ban » duc tan, duc van, dua ban
cua tre » cua te, cuu tre, cua triet
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.

• Performing a fuzzy search may retrieve terms with similar spellings: su sach tu nang ((x hoi) or (o hoi)). hieu van lam duc ban thanh phan cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach tu nang ((x hoi) OR (o hoi)). hieu van lam duc ban thanh phan cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach tu nang ((x hoi) or (o hoi)). hieu van lam duc ban thanh phan cua tre*.