Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
nuoc ban » quoc ban, buoc ban, duoc ban
chat hoc » chat hoa, chat thom, cho hoc
nuoc san » nuoc luan, nguoi san, nuoc quan
tai cuu » tai cuc, tai buu, tai cua
tu sach » thu sach, su sach, te sach
hieu ve » hieu va, hieu van
cao hoc » co hoc, cho hoc
cuu tre » cua tre, cau tren, cau treo
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 ((cao hoc) OR (chat hoc)). hieu ve cac ((nuoc ban) or (nuoc san)) thanh tai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang ((cao hoc) OR (chat hoc)). hieu ve cac ((nuoc ban) OR (nuoc san)) thanh tai cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang ((cao hoc) OR (chat hoc)). hieu ve cac ((nuoc ban) or (nuoc san)) thanh tai cuu tre".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang ((cao hoc) OR (chat hoc)). hieu ve cac ((nuoc ban) or (nuoc san)) thanh tai cuu tre*.