Perhaps you should try some spelling variations:
thanh ha » thanh hoa, thanh hai, nhanh ha
te sach » toc sach
cao duc » dao duc, cao suc, giao duc
cua tre » cua te, cuu tre, cua triet
cac duc » cac du, cac dac, cac nuoc
hieu ve » hieu va, hieu van
nang ma » tang ma, sang ma, nang cao
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, ma hoa

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 ma hoi. hieu ve ((cac duc) OR (cao duc)) va ((thanh ha) OR (thanh san)) cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y nang ma hoi. hieu ve ((cac duc) OR (cao duc)) va ((thanh ha) or (thanh san)) cua tre~".
• Adding a wildcard symbol may retrieve word variants: te sach y nang ma hoi. hieu ve ((cac duc) OR (cao duc)) va ((thanh ha) or (thanh san)) cua tre*.