Perhaps you should try some spelling variations:
hanh tai » thanh tai, hang tai, han tai
ban hanh » ban hang
tai cua » thai cua, tai cuc, tri cua
xuc ban » duc ban, cuc ban, quoc ban
cua tre » cua te, cuu tre, cua triet
sach ty » sach tu, sach thu, xach tay
cao hoc » co hoc, cho hoc, chat hoc
ve cac » vien cac

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 cao hoc. hieu ((ve cac) OR (va cac)) xuc 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 cao hoc. hieu ((ve cac) OR (va cac)) xuc ban hanh tai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ty) or (sach y)) nang cao hoc. hieu ((ve cac) OR (va cac)) xuc ban hanh tai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) or (sach y)) nang cao hoc. hieu ((ve cac) OR (va cac)) xuc ban hanh tai cua tre*.