Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
danh sai » danh bat, danh dau, hanh san
dung sai » dung tai, dung va, dung dat
sach ky » sac ky, sach y, sach ty
cao hoa » cao hoat, cao khoa, cau hoa
cua tre » cua te, cuu tre, cua triet
he nam » nghe nam
thu xa » thu xac, thu ha, thu xe

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ky nang cao hoa. hieu ((he nam) OR (ha nam)) thu xa ((danh sai) or (dung sai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky nang cao hoa. hieu ((he nam) OR (ha nam)) thu xa ((danh sai) OR (dung sai)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky nang cao hoa. hieu ((he nam) OR (ha nam)) thu xa ((danh sai) or (dung sai)) cua tre".
• Adding a wildcard symbol may retrieve word variants: toc sach ky nang cao hoa. hieu ((he nam) OR (ha nam)) thu xa ((danh sai) or (dung sai)) cua tre*.