Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
va thanh » gia thanh, ban thanh, va tinh
su sach » so sach, vu sach
cam duc » cam xuc, cao duc, pham duc
hieu va » lieu va, hieu qua
sach tu » sach thu, cach tu, sach ty
hieu ve » hieu van
hanh ma » hanh mau, hanh may, hanh va
hanh xa » hanh va, hanh xu, canh xa
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: su sach tu ((hanh xa) or (hanh ma)) hoi. ((hieu ve) OR (hieu va)) cam duc va thanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach tu ((hanh xa) OR (hanh ma)) hoi. ((hieu ve) OR (hieu va)) cam duc va thanh dai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach tu ((hanh xa) or (hanh ma)) hoi. ((hieu ve) OR (hieu va)) cam duc va thanh dai cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach tu ((hanh xa) or (hanh ma)) hoi. ((hieu ve) OR (hieu va)) cam duc va thanh dai cua tre*.