Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh va, hanh tai
tay lang » tai lang, tay tang, tay quang
hieu van » hieu va, thien van, lieu va
su sach » so sach
vai cua » dai cua, hai cua, lai cua
van cam » van nam, van lam, van cau
lang xa » lang ha, dang xay, lang van
vu sach » vu bach, vu khach
cua tre » cua te, cuu tre, cua triet
luc va » duc va, tuc va, loc va

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)) tay lang xa hoi. hieu van cam ((luc va) or (hoc va)) hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) tay lang xa hoi. hieu van cam ((luc va) OR (hoc va)) hanh vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (vu sach)) tay lang xa hoi. hieu van cam ((luc va) or (hoc va)) hanh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((su sach) OR (vu sach)) tay lang xa hoi. hieu van cam ((luc va) or (hoc va)) hanh vai cua tre*.