Perhaps you should try some spelling variations:
thanh lai » thanh hai, thanh lap, thanh loi
thu sach » tu sach, thuat sach, thuoc sach
hieu van » hieu va, thien van, lieu va
duoc ban » duc ban, buoc ban, duoc bat
quoc ban » quoc bao, quoc lan, quoc quan
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
lai cua » dai cua, hai cua, lai chau
cua tre » cua te, cuu tre, cua triet

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ky nang xa hoi. hieu van nam ((duoc ban) or (quoc ban)) thanh lai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang xa hoi. hieu van nam ((duoc ban) OR (quoc ban)) thanh lai cua tre.
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang xa hoi. hieu van nam ((duoc ban) or (quoc ban)) thanh lai cua tre*.