Perhaps you should try some spelling variations:
chat hoc » chat thom, cho hoc, vat hoc
hanh tai » thanh tai, hang tai, han tai
chat hoa » thuat hoa, chat va, chat huu
ban hanh » ban hang
tu sach » thu sach, su sach, te sach
ve cham » va cham, ve chat, vu cham
tai cua » thai cua, tai cuc, tri cua
xuc ban » duc ban, cuc ban, quoc ban
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
ve cac » va 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 y nang ((chat hoc) OR (chat hoa)). hieu ((ve cac) or (ve cham)) xuc ban hanh tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang ((chat hoc) OR (chat hoa)). hieu ((ve cac) OR (ve cham)) xuc ban hanh tai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang ((chat hoc) OR (chat hoa)). hieu ((ve cac) or (ve cham)) xuc ban hanh tai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang ((chat hoc) OR (chat hoa)). hieu ((ve cac) or (ve cham)) xuc ban hanh tai cua tre*.