Perhaps you should try some spelling variations:
hanh tai » thanh tai, hang tai, han tai
nang cho » nang chon, ngang cho, nang cao
quoc ban » quoc bao, quoc lan, quoc quan
hieu van » hieu va, thien van, lieu va
xuc ban » duc ban, cuc ban, xuat ban
tai cua » thai cua, tai cuc, tri cua
van cac » van hac, van cau, van bac
sach ty » sach tu, sach thu, xach tay
cho hoc » co hoc, khoa hoc
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: tu ((sach ty) or (sach y)) nang cho hoc. hieu van cac ((xuc ban) or (quoc ban)) hanh tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ty) OR (sach y)) nang cho hoc. hieu van cac ((xuc ban) OR (quoc ban)) hanh tai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) or (sach y)) nang cho hoc. hieu van cac ((xuc ban) or (quoc ban)) hanh tai cua tre*.