Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
tham thuc » pham thuc, tam thuc, thai thuc
nham thuc » nhan thuc, nam thuc, nham thu
dan doanh » van doanh, san doanh, ban doanh
doanh van » doan van, doanh va, doanh ban
sach ky » sac ky, sach y, sach ty
van cua » vang cua, ban cua, dan cua
cua tre » cua te, cuu tre, cua triet
x hoi » xa hoi, o hoi, x ho

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 ky nang x hoi. lieu va ((tham thuc) OR (nham thuc)) dan doanh van cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach ky nang x hoi. lieu va ((tham thuc) OR (nham thuc)) dan doanh van cua tre".
• Adding a wildcard symbol may retrieve word variants: thuoc sach ky nang x hoi. lieu va ((tham thuc) OR (nham thuc)) dan doanh van cua tre*.