Perhaps you should try some spelling variations:
toc sach » doc sach, thuoc sach, nuoc sach
hoc sach » hoc sinh, hoc cac, hoc anh
danh vai » danh sai, danh va, doanh van
vat danh » va danh, van danh, luat danh
va cham » va chat, va tham
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet
hang xa » hoang xa, hang va, hang ca
ty hang » ly hang, ty xang, thi hang
va cam » va cac, va cao, va cai

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)) ty hang xa hoi. lieu ((va cam) or (va cham)) thuc vat danh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (hoc sach)) ty hang xa hoi. lieu ((va cam) OR (va cham)) thuc vat danh vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) OR (hoc sach)) ty hang xa hoi. lieu ((va cam) or (va cham)) thuc vat danh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) OR (hoc sach)) ty hang xa hoi. lieu ((va cam) or (va cham)) thuc vat danh vai cua tre*.