Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
toc sach » hoc sach, doc sach, thuoc sach
ban hanh » ban hang
tra nang » thi nang, kha nang, da nang
hieu van » hieu va, thien van, lieu va
van cham » van chat, van tham, va cham
cham xuc » cam xuc, chat xuc, cham soc
sach tra » sach tranh, sach tham, sach tren
cua tre » cua te, cua triet, dua tren
cuu tre » cau tren, cau treo
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: toc sach tra nang o hoi. hieu van cham xuc ((van thanh) or (ban hanh)) hai ((cua tre) OR (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach tra nang o hoi. hieu van cham xuc ((van thanh) OR (ban hanh)) hai ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach tra nang o hoi. hieu van cham xuc ((van thanh) or (ban hanh)) hai ((cua tre) OR (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: toc sach tra nang o hoi. hieu van cham xuc ((van thanh) or (ban hanh)) hai ((cua tre) OR (cuu tre))*.