Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
so sach » so sanh, bo sach, co sach
sach yu » sach y, sach tu, sach uu
yu hang » yu zhang, yu pang, yu wang
hang co » hang cho, hang ca, nang co
van dau » van dao, phan dau
dau luc » cau luc, dau luan, dau nuoc
va hanh » van hanh, va thanh, va danh
cua tre » cuu tre, cua triet, dua tren
co loi » co hoi
luc va » duc va, tuc va, loc va
cua te » cua tu

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 yu hang co loi. hieu van dau luc va hanh vi ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach yu hang co loi. hieu van dau luc va hanh vi ((cua tre) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: so sach yu hang co loi. hieu van dau luc va hanh vi ((cua tre) or (cua te))*.