Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
dang xay » dang van
danh hai » dang hai, lanh hai, manh hai
ban danh » ban doanh, ban hanh, ban dan
cam duc » cam xuc, cao duc, nam duoc
hai cua » thai cua, dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua

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 ((dang xay) OR (van xay)) hoi. hieu va ((cam duc) or (pham duc)) ban danh hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky ((dang xay) OR (van xay)) hoi. hieu va ((cam duc) OR (pham duc)) ban danh hai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky ((dang xay) OR (van xay)) hoi. hieu va ((cam duc) or (pham duc)) ban danh hai cua tre*".