Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
doanh van » doan van, doanh va, doanh ban
nham thuc » nhan thuc, nam thuc, nham thu
danh vai » danh sai, danh va, dang van
va nham » va cham, va tham, va nha
sach ty » sach y, sach tu, sach thu
thuc va » thuc vat, thuc dan, thuc day
ty nang » ky nang, ty xang, ty hang
cua tre » cua te, cuu tre, cua triet
x hoi » o hoi, x ho, 5 hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc sach ty nang ((x hoi) OR (xa hoi)). lieu va nham thuc va ((danh vai) or (doanh van)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ty nang ((x hoi) OR (xa hoi)). lieu va nham thuc va ((danh vai) OR (doanh van)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach ty nang ((x hoi) OR (xa hoi)). lieu va nham thuc va ((danh vai) or (doanh van)) cua tre".
• Adding a wildcard symbol may retrieve word variants: thuoc sach ty nang ((x hoi) OR (xa hoi)). lieu va nham thuc va ((danh vai) or (doanh van)) cua tre*.