Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
hieu van » hieu va, thien van, lieu va
duc manh » suc manh, duc anh, duc minh
te sach » toc sach
dua ban » dia ban, cua ban, qua ban
van cam » van nam, van lam, van cau
sach ky » sac ky, sach y, sach ty
ky sang » ky nang, ky dang, ky tang
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, me hoi

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 ky sang ((ma hoi) OR (ma hoa)). hieu van cam ((duc manh) OR (dua ban)) thanh dai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky sang ((ma hoi) OR (ma hoa)). hieu van cam ((duc manh) or (dua ban)) thanh dai cua tre~".
• Adding a wildcard symbol may retrieve word variants: te sach ky sang ((ma hoi) OR (ma hoa)). hieu van cam ((duc manh) or (dua ban)) thanh dai cua tre*.