Perhaps you should try some spelling variations:
duc manh » suc manh, duc anh, duc minh
vanh dai » van dai, vanh tai, lanh dao
ky tang » ky nang, kho tang, ky trong
ky dang » ky nang, ky danh
hoa hoi » khoa hoi, hoa hoc, hoa doi
hieu ve » hieu va, hieu van
ve chat » va chat, van chat
vuc van » duc van, luc van, thuc van
cua tre » cua te, cuu tre, cua triet
tu bai » tu ban, tu bat, te bai

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: tu bai ((ky tang) OR (ky dang)) hoa hoi. hieu ve chat ((vuc van) OR (duc manh)) vanh dai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu bai ((ky tang) OR (ky dang)) hoa hoi. hieu ve chat ((vuc van) or (duc manh)) vanh dai cua tre~".
• Adding a wildcard symbol may retrieve word variants: tu bai ((ky tang) OR (ky dang)) hoa hoi. hieu ve chat ((vuc van) or (duc manh)) vanh dai cua tre*.