Perhaps you should try some spelling variations:
dau theo » cau theo, dai theo, dam theo
dang cay » dang xay, dang ca, dang cac
cay phoi » cap phoi, tay hoi, cay cho
hieu van » hieu va, thien van, lieu va
dau treo » dau tren, cau treo, dau tien
danh van » doanh van, dang van, dinh van
ky dang » ky nang, ky danh
van cau » van dau, van hau, van chat
tu sac » tu sach, tu cac, tu san
tuc va » thuc va, truc va, tuc xa
sac ky » cac ky, sai ky
luc va » duc va, loc va

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 sac ky dang cay phoi. hieu van cau ((luc va) OR (tuc va)) danh van ((dau treo) OR (dau theo))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky dang cay phoi. hieu van cau ((luc va) or (tuc va)) danh van ((dau treo) OR (dau theo))~".
• Adding a wildcard symbol may retrieve word variants: tu sac ky dang cay phoi. hieu van cau ((luc va) or (tuc va)) danh van ((dau treo) OR (dau theo))*.