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

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