Perhaps you should try some spelling variations:
tang thanh » dang thanh, trung thanh, hoang thanh
thanh vai » thanh hai, thanh van, thanh tai
hieu van » hieu va, thien van, lieu va
duc tang » duc thang, duc tan, tuc tang
cau treo » cau theo, cau tren, cau triet
tu sach » thu sach, su sach, te sach
van bao » van ban, van dao
bao duc » dao duc, bao luc, cao duc
cuu tre » cua tre, cau tren
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 sach y nang x hoi. hieu van bao duc tang thanh vai ((cuu tre) OR (cau treo))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang x hoi. hieu van bao duc tang thanh vai ((cuu tre) OR (cau treo))".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang x hoi. hieu van bao duc tang thanh vai ((cuu tre) OR (cau treo))*.