Perhaps you should try some spelling variations:
thien van » thi van
toc sach » hoc sach, doc sach, thuoc sach
van tham » van thanh, van tuan, van chat
thuc dan » thuc hanh, hoc dan, thuc vat
danh sai » dung sai, danh bat, danh dau
sach ky » sac ky, sach y, sach ty
thuc va » thuc vat, thuc day
sai cua » dai cua, hai cua, lai 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.

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