Perhaps you should try some spelling variations:
thanh ho » thanh pho, thanh hoa, thanh hoc
thanh co » thanh do, thanh ca, thanh vo
hieu van » hieu va, thien van, lieu va
su sach » so sach, vu sach
van cam » van nam, van lam, van cau
te sach » toc sach
cua tre » cua te, cuu tre, cua triet
xuc va » duc va, tuc va, luc va
nang o » nang co, nang ho, nang ro
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 co) OR (thanh ho)) 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 co) OR (thanh ho)) 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 co) OR (thanh ho)) 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 co) OR (thanh ho)) cua tre*.