Perhaps you should try some spelling variations:
thanh van » thanh san, thanh toan, thanh phan
hieu van » hieu va, thien van, lieu va
dang xay » dang van, van xay
van cuu » van cau, van chu, van cu
cuu tre » cua tre, cau tren, cau treo
xay hoi » xa hoi, tay hoi, cay phoi
ky dang » ky nang, ky danh
xuc va » duc va, tuc va, luc va
su cao » cu cao, vu cao, su co
su cac » tu cac, su can, eu cac

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

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