Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
dang xay » dang van, van xay
hang dau » hang va, hang tai
lang xa » lang ha, lang van
hieu ve » hieu va, hieu van
cac xuc » cam xuc, cac nuoc, chat xuc
va hang » van hang, va nang, va lang
dau cua » dai cua, day cua, cau cua
cua tre » cua te, cuu tre, cua triet
ve cac » va cac, vien cac
xuc va » duc va, tuc va, luc va

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach y ((lang xa) OR (dang xay)) hoi. hieu ve cac xuc va hang dau cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach y ((lang xa) OR (dang xay)) hoi. hieu ve cac xuc va hang dau cua tre".
• Adding a wildcard symbol may retrieve word variants: toc sach y ((lang xa) OR (dang xay)) hoi. hieu ve cac xuc va hang dau cua tre*.