Perhaps you should try some spelling variations:
hanh dien » nhanh dien, hang dien, danh dien
te sach » toc sach
cau luc » cau truc, cau phuc
cua tre » cuu tre, cua triet, dua tren
va hanh » van hanh, va thanh, va danh
hieu ve » hieu va, hieu van
sach ky » sac ky, sach y, sach ty
ve cau » ke cau, va cau, ve cac
luc va » duc va, tuc va, loc va
co hoi » co hoc, co loi
cua te » cua tu
o hoi » o hoc, o hai, o hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky nang ((o hoi) or (co hoi)). hieu ve cau luc va hanh dien ((cua tre) OR (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang ((o hoi) OR (co hoi)). hieu ve cau luc va hanh dien ((cua tre) OR (cua te))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang ((o hoi) or (co hoi)). hieu ve cau luc va hanh dien ((cua tre) OR (cua te))*".