Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
hieu van » hieu va, thien van, lieu va
hieu ve » hieu va
cuu tre » cua tre, cau tren, cau treo
xay hoi » xa hoi, tay hoi, cay phoi
ky dang » ky nang, ky danh
ty dang » ty xang, ty hang, ty dong
xuc va » duc va, tuc va, luc va
va dao » ca dao
dao da » dao dan, dao do, dao va
da cuu » da cau, da cu, da cua

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

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