Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
va thanh » gia thanh, ban thanh, va tinh
hanh may » hanh ma, hanh mau, hanh ngay
so sach » so sanh, bo sach, co sach
cao duc » dao duc, cao suc, giao duc
cam duc » cam xuc, pham duc, nam duoc
sach tu » sach thu, cach tu, sach ty
hieu va » lieu va, hieu qua
hanh xa » hanh va, hanh ma, hanh xu
cua tre » cua te, cuu tre, cua triet

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

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