Perhaps you should try some spelling variations:
thanh trinh » hanh trinh, thanh tinh, thanh binh
hieu van » hieu va, thien van, lieu va
va thanh » gia thanh, ban thanh, va tinh
so sach » so sanh, bo sach, co sach
cua tre » cua te, cua triet, dua tren
dao xuc » dao duc, dao tuc, dao xu
ty nang » ky nang, ty hang, ly nang
cuu tre » cau tren, cau treo
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 ((ty nang) OR (ty xang)) xa hoi. hieu van dao xuc va thanh trinh ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ((ty nang) OR (ty xang)) xa hoi. hieu van dao xuc va thanh trinh ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ((ty nang) OR (ty xang)) xa hoi. hieu van dao xuc va thanh trinh ((cua tre) or (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: so sach ((ty nang) OR (ty xang)) xa hoi. hieu van dao xuc va thanh trinh ((cua tre) or (cuu tre))*.