Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
thuc day » thuc dan, thuc vat
thi hang » thi hanh, thi nang, thi hong
thuc va » thuc vat, thuc dan
cuu tre » cua tre, cau tren, cau treo
hieu va » lieu va, hieu qua
van hoi » van hoa, van hoc, van hoe
ty hang » ly hang, ty xang, thu hang
dan va » doan va, dan ca, ban va
va cuu » va cau, va chu, va huu
va nam » van nam, ha nam, va nay

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