Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, hieu ve
dang xay » dang van, van xay
toc sac » toc sach, toc san, hoc sach
vai cuu » vai cua
dan vai » dan va, dan tai, dan vat
cuu tre » cua tre, cau tren, cau treo
ky dang » ky nang, ky danh
xay hoi » xa hoi, tay hoi, cay phoi
sac ky » cac ky, sai ky
xuc va » duc va, luc va, xac va
tuc va » thuc va, truc va, tuc xa

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

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