Perhaps you should try some spelling variations:
thanh hai » thanh phan, thanh hoa, thanh san
thanh vai » thanh van, thanh tai, thanh oai
duc dang » duc dung, duc dong, duc bang
hieu van » hieu va, thien van, lieu va
tu cach » tu cac
bao duc » dao duc, bao luc, cao duc
van bao » van ban, van dao
te sach » toc sach
cuu tre » cua tre, cau tren, cau treo
y nang » ky nang, ly nang, v nang
x hoi » xa hoi, o hoi, x ho

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

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