Perhaps you should try some spelling variations:
thanh dam » thanh dat, thanh nam, thanh tam
thanh dao » thanh dat, thanh do, hanh dao
nang lai » nang tai, mang lai, nang cai
so sach » so sanh, bo sach, co sach
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
hieu ve » hieu van
lai hoa » dai hoa, loai hoc
xuc va » duc va, tuc va, luc va

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 ky nang lai hoa. ((hieu ve) or (hieu va)) cam xuc va ((thanh dao) OR (thanh dam)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky nang lai hoa. ((hieu ve) OR (hieu va)) cam xuc va ((thanh dao) OR (thanh dam)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ky nang lai hoa. ((hieu ve) or (hieu va)) cam xuc va ((thanh dao) OR (thanh dam)) cua tre".
• Adding a wildcard symbol may retrieve word variants: so sach ky nang lai hoa. ((hieu ve) or (hieu va)) cam xuc va ((thanh dao) OR (thanh dam)) cua tre*.