Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
dang xay » dang van, van xay
xa thanh » va thanh, ha thanh, ta thanh
su sach » so sach
xay hoi » xa hoi, tay hoi, cay phoi
ky dang » ky nang, ky danh
vu sach » vu bach, vu khach
cua tre » cua te, cuu tre, cua triet
va cam » va cham, va cao, va cai

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) OR (vu sach)) ky dang xay hoi. hieu ((va cam) or (va cac)) tuc xa thanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) ky dang xay hoi. hieu ((va cam) OR (va cac)) tuc xa thanh dai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (vu sach)) ky dang xay hoi. hieu ((va cam) or (va cac)) tuc xa thanh dai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((su sach) OR (vu sach)) ky dang xay hoi. hieu ((va cam) or (va cac)) tuc xa thanh dai cua tre*.