Perhaps you should try some spelling variations:
lang thai » lang chai, dang thai, lang hai
thu sach » tu sach, thuat sach, thuoc sach
hieu van » thien van, lieu va, hieu ve
thai cua » than cua, tai cuc, tri cua
sach ky » sac ky, sach y, sach ty
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
xuc ban » duc ban, cuc ban, quoc ban
duc van » duc va, duc tan, duc manh
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: thu sach ky lang xa hoi. ((hieu van) or (hieu va)) cam ((xuc ban) or (duc van)) lang thai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky lang xa hoi. ((hieu van) OR (hieu va)) cam ((xuc ban) OR (duc van)) lang thai cua tre.
• Adding a wildcard symbol may retrieve word variants: thu sach ky lang xa hoi. ((hieu van) or (hieu va)) cam ((xuc ban) or (duc van)) lang thai cua tre*.