Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
hieu van » hieu va, thien van, lieu va
va thanh » gia thanh, va tinh, le thanh
van cam » van nam, van lam, van cau
su sach » so sach, vu sach
te sach » toc sach
cua tre » cua te, cuu tre, cua triet
nang o » nang co, nang ho, nang ro
co cua » con cua, ca cua, cong cua
o hoi » co hoi, o hoc, o hai

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