Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hieu cac » hieu luc, hieu va, hieu van
hieu cao » chieu cao, hieu ca, kieu cao
sach ty » sach y, sach tu, sach thu
lang xa » lang ha, dang xay, lang van
xuc van » duc van, luc van, xuc ban
vuc van » duc van, luc van, thuc van
ty lang » tay lang, ty xang, ty hang
tuan vi » quan vi, luan vi, quans vi
cua tre » cua te, cuu tre, cua triet
vi cua » vai cua, di cua

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 ty lang xa hoi. ((hieu cao) or (hieu cac)) chat ((xuc van) OR (vuc van)) tuan vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty lang xa hoi. ((hieu cao) OR (hieu cac)) chat ((xuc van) OR (vuc van)) tuan vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ty lang xa hoi. ((hieu cao) or (hieu cac)) chat ((xuc van) OR (vuc van)) tuan vi cua tre".
• Adding a wildcard symbol may retrieve word variants: thu sach ty lang xa hoi. ((hieu cao) or (hieu cac)) chat ((xuc van) OR (vuc van)) tuan vi cua tre*.