Perhaps you should try some spelling variations:
toc sach » doc sach, thuoc sach, nuoc sach
hoc sach » hoc sinh, hoc cac, hoc anh
dang xay » dang van, van xay
ky dang » ky nang, ky danh
xay hoi » xa hoi, tay hoi, cay phoi
thuc va » thuc vat, thuc dan, thuc day
cuu tre » cua tre, cau tren, cau treo
va dao » ca dao
dao va » dao van, tao va, do va
va cuu » va cau, va chu, va huu

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

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