Perhaps you should try some spelling variations:
chat duoc » chet duoc, thuat duoc, luat duoc
chat doc » chat hoc, chau doc, thuat doc
van hanh » van thanh, van anh, van ban
ban hanh » ban hang
thi van » thi lan, thi hanh, thi nang
cua tre » cua te, cuu tre, cua triet
vi cua » vai cua, di cua

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 cac ky nang x ho. thi van ((chat duoc) OR (chat doc)) ((van hanh) OR (ban hanh)) vi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu cac ky nang x ho. thi van ((chat duoc) or (chat doc)) ((van hanh) OR (ban hanh)) vi cua tre~".
• Adding a wildcard symbol may retrieve word variants: tu cac ky nang x ho. thi van ((chat duoc) or (chat doc)) ((van hanh) OR (ban hanh)) vi cua tre*.