Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hanh vai » hanh vi, hanh va, hanh tai
dang xay » dang van, van xay
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
xay hoi » xa hoi, tay hoi, cay phoi
tu ban » thu ban
te ban » te bao
y dang » ky dang, 2 dang, _ dang
ve cam » ve cham, ve cac, va cam

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)) y dang xay hoi. hieu ve cam ((tu ban) OR (te ban)) hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) y dang xay hoi. hieu ve cam ((tu ban) OR (te ban)) hanh vai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (toc sach)) y dang xay hoi. hieu ve cam ((tu ban) OR (te ban)) hanh vai cua tre*".