Perhaps you should try some spelling variations:
thanh thai » thanh hai, thanh tai, nhanh thai
ban thanh » ban hanh, ban hang
thai cua » than cua, tai cuc, tri cua
sach tu » sach thu, cach tu, sach uu
cam duc » cam xuc, cao duc, nam duoc
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va, hieu qua
sach ty » sach y, sach thu, xach tay
va hoi » xa hoi, va hoc, va hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach tu) or (sach ty)) hang va hoi. hieu va ((cam duc) OR (pham duc)) ban thanh thai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach tu) OR (sach ty)) hang va hoi. hieu va ((cam duc) OR (pham duc)) ban thanh thai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach tu) or (sach ty)) hang va hoi. hieu va ((cam duc) OR (pham duc)) ban thanh thai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu ((sach tu) or (sach ty)) hang va hoi. hieu va ((cam duc) OR (pham duc)) ban thanh thai cua tre*.