Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hanh gia » danh gia, thanh gian, hinh giao
van hanh » van thanh, ban hanh, van anh
ve chat » va chat, van chat
gia cua » gian cua, giau cua, gia cuc
ve cham » va cham, vu cham, ve chim
ty hang » ly hang, ty xang, thi hang
cua tre » cua te, cuu tre, cua triet
va hoi » xa hoi, va hoc, va hoa
lo van » le van, vo van, so van

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ty hang va hoi. hieu ((ve cham) OR (ve chat)) lo van hanh gia cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) ty hang va hoi. hieu ((ve cham) or (ve chat)) lo van hanh gia cua tre~".
• Adding a wildcard symbol may retrieve word variants: ((te sach) OR (toc sach)) ty hang va hoi. hieu ((ve cham) or (ve chat)) lo van hanh gia cua tre*.