Perhaps you should try some spelling variations:
sach doi » sach hoi, sach moi, sach dao
dang xay » dang van, van xay
va tham » van tham, va thanh, va thuat
hanh va » hang va, hanh vi
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
va cham » va chat
sach do » sach dao, sach de, sach lo
xay hoi » xa hoi, tay hoi, cay phoi
cua tre » cua te, cuu tre, cua triet
va cua » va chua, via cua, ca cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: su ((sach do) OR (sach doi)) dang xay hoi. hieu ((va cham) or (va tham)) thuc va hanh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach do) OR (sach doi)) dang xay hoi. hieu ((va cham) OR (va tham)) thuc va hanh va cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach do) OR (sach doi)) dang xay hoi. hieu ((va cham) or (va tham)) thuc va hanh va cua tre*".