Perhaps you should try some spelling variations:
thanh dat » thanh san, thanh hai, thanh van
te sach » toc sach
cao hoi » cau hoi, cao hoc, tao hoi
hieu ve » hieu va, hieu van
cao duc » dao duc, cao suc, giao duc
cac dac » cac dan, cac dai, cac bac
dat cua » dai cua, day cua, mat cua
y nang » ky nang, ly nang, v nang
co hoi » co hoc, co loi
cua te » cua tu

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

• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y nang ((cao hoi) OR (co hoi)). hieu ve ((cao duc) OR (cac dac)) gia thanh dat cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y nang ((cao hoi) OR (co hoi)). hieu ve ((cao duc) or (cac dac)) gia thanh dat cua te~".
• Adding a wildcard symbol may retrieve word variants: te sach y nang ((cao hoi) OR (co hoi)). hieu ve ((cao duc) or (cac dac)) gia thanh dat cua te*.