Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
xang mai » lang mai, sang mai, hoang mai
dao sinh » dao minh, dao dinh, dao tinh
sinh cua » manh cua, dinh cuu, sinh va
mai hoi » mai khoi, dai hoi, lai hoi
qua cac » cua cac
cac toc » cac toi, cac nuoc, cac thoi
cua tre » cua te, cuu tre, cua triet
y xang » ty xang
toc ca » toc cao, toc ta, toc co

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 xang mai hoi. hieu qua cac toc ca dao sinh cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) y xang mai hoi. hieu qua cac toc ca dao sinh cua tre".
• Adding a wildcard symbol may retrieve word variants: ((te sach) OR (toc sach)) y xang mai hoi. hieu qua cac toc ca dao sinh cua tre*.