Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
thanh va » thanh van, hanh va, thanh ha
te sach » toc sach
sach ky » sac ky, sach y, sach ty
van cao » van dao, van hao, van cau
van bao » van ban, van dao
duc van » duc va, duc tan, duc manh
cuu tre » cua tre, cau tren, cau treo
va cuu » va cau, va chu, va huu
x hoi » o hoi, x ho, 5 hoi

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky nang ((x hoi) or (xa hoi)). hieu ((van cao) OR (van bao)) duc van thanh va cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang ((x hoi) OR (xa hoi)). hieu ((van cao) OR (van bao)) duc van thanh va cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang ((x hoi) or (xa hoi)). hieu ((van cao) OR (van bao)) duc van thanh va cuu tre".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang ((x hoi) or (xa hoi)). hieu ((van cao) OR (van bao)) duc van thanh va cuu tre*.