Perhaps you should try some spelling variations:
te sach » toc sach
cau luc » cau truc, cau phuc
cua tre » cuu tre, cua triet, dua tren
danh di » danh du, xanh di, danh dien
va danh » va dinh, va dan, va hanh
hieu ke » hieu kem, chieu ke, hieu ky
sach ky » sac ky, sach y, sach ty
ke cau » ket cau
luc va » duc va, tuc va, loc va
ro hoi » co hoi, mo hoi, ro doi
cua te » cua tu
o hoi » co hoi, o hoc, o hai

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 ((ro hoi) or (o hoi)). hieu ke cau luc va danh di ((cua tre) OR (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang ((ro hoi) OR (o hoi)). hieu ke cau luc va danh di ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang ((ro hoi) or (o hoi)). hieu ke cau luc va danh di ((cua tre) OR (cua te))".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang ((ro hoi) or (o hoi)). hieu ke cau luc va danh di ((cua tre) OR (cua te))*.