Perhaps you should try some spelling variations:
thien van » thi van
thanh vai » thanh hai, thanh van, thanh oai
thanh tai » thanh hai, thanh toan, doanh tai
tu sach » thu sach, su sach, te sach
van bao » van ban, van dao
bao duc » dao duc, bao luc, cao duc
duc van » duc va, duc tan, duc manh
cua tre » cua te, cuu tre, cua triet
y nang » ly nang, v nang, may 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) or (ky nang)) x hoi. thien van bao duc van ((thanh vai) OR (thanh tai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((y nang) OR (ky nang)) x hoi. thien van bao duc van ((thanh vai) OR (thanh tai)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((y nang) or (ky nang)) x hoi. thien van bao duc van ((thanh vai) OR (thanh tai)) cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ((y nang) or (ky nang)) x hoi. thien van bao duc van ((thanh vai) OR (thanh tai)) cua tre*.