Perhaps you should try some spelling variations:
thien van » thi van
thanh doi » thanh loi, thanh moi, thanh hoai
thanh do » thanh de, thanh pho, thanh hoa
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
cua tre » cua te, cuu tre, cua triet
xuc va » tuc va, luc va, xac va

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 ky nang xa hoi. thien van nam ((xuc va) or (duc va)) ((thanh doi) OR (thanh do)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xa hoi. thien van nam ((xuc va) OR (duc va)) ((thanh doi) OR (thanh do)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang xa hoi. thien van nam ((xuc va) or (duc va)) ((thanh doi) OR (thanh do)) cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xa hoi. thien van nam ((xuc va) or (duc va)) ((thanh doi) OR (thanh do)) cua tre*.