Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
va thanh » gia thanh, ban thanh, va tinh
thanh vi » hanh vi, thanh va, thanh ve
ky danh » ky anh, ky dang
danh xa » danh ca, dinh xa, canh xa
van cam » van lam, van cau, van dam
cua tre » cua te, cuu tre, cua triet
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) or (toc sach)) ky danh xa hoi. hieu ((van cam) OR (van nam)) duc va thanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ky danh xa hoi. hieu ((van cam) OR (van nam)) duc va thanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (toc sach)) ky danh xa hoi. hieu ((van cam) OR (van nam)) duc va thanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (toc sach)) ky danh xa hoi. hieu ((van cam) OR (van nam)) duc va thanh vi cua tre*.