Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
dang xay » dang van, van xay
duoc tan » duoc ban, duoc dan, duoc tap
ky dang » ky nang, ky danh
xay hoi » xa hoi, tay hoi, cay phoi
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
te san » te ban, tu san, ta san
ke san » ke dan
ve tao » ve bao, de tao, ve tac

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te san) OR (ke san)) ky dang xay hoi. hieu ve tao ((duoc tan) or (duc tan)) thanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te san) OR (ke san)) ky dang xay hoi. hieu ve tao ((duoc tan) OR (duc tan)) thanh dai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te san) OR (ke san)) ky dang xay hoi. hieu ve tao ((duoc tan) or (duc tan)) thanh dai cua tre*".