Perhaps you should try some spelling variations:
thien van » thi van
hanh vai » hanh vi, hanh tai, hanh van
hieu van » hieu va, lieu va, hieu ve
tu sach » thu sach, su sach, te sach
duc ban » duc tan, duc van, dua ban
hanh va » hang va, hanh vi
lam duc » lam duoc, pham duc, nam duoc
sach ky » sac ky, sach y, sach ty
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
cua tre » cua te, cuu tre, cua triet

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 lang xa hoi. ((hieu van) OR (thien van)) lam duc ban ((hanh vai) or (hanh va)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky lang xa hoi. ((hieu van) OR (thien van)) lam duc ban ((hanh vai) OR (hanh va)) cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky lang xa hoi. ((hieu van) OR (thien van)) lam duc ban ((hanh vai) or (hanh va)) cua tre*".