Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh va, hanh tai
ban hanh » ban hang
thi hang » thi hanh, thi nang, thi hong
hieu van » hieu va, thien van, lieu va
su sach » so sach
vai cua » dai cua, hai cua, lai cua
luc ban » duc ban, cuc ban, luc bat
cau luc » cau truc, cau phuc
van cau » van dau, van hau, van chat
ty hang » ly hang, ty xang, thu hang
vu sach » vu bach, vu khach
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) or (vu sach)) ((ty hang) or (thi hang)) xa hoi. hieu van cau luc ban hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) ((ty hang) OR (thi hang)) xa hoi. hieu van cau luc ban hanh vai cua tre.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vu sach)) ((ty hang) or (thi hang)) xa hoi. hieu van cau luc ban hanh vai cua tre*.