Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
dua tren » dung tren
tinh lai » tinh lao, tinh hai, minh lai
cham xuc » cam xuc, chat xuc, cham soc
ve cham » va cham, ve chat, vu cham
va tinh » may tinh
hieu ve » hieu va, hieu van
hai hoi » dai hoi, hai moi, hai hai
ty hang » ly hang, ty xang, thi hang
ty lang » tay lang, ty xang, tu lang
cua tre » cua te, cuu tre, cua triet
xuc va » duc va, tuc va, luc va

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

• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ((ty lang) OR (ty hang)) hai hoi. hieu ve cham xuc va tinh lai ((dua tren) OR (cua tre))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ((ty lang) OR (ty hang)) hai hoi. hieu ve cham xuc va tinh lai ((dua tren) or (cua tre))~".
• Adding a wildcard symbol may retrieve word variants: toc sach ((ty lang) OR (ty hang)) hai hoi. hieu ve cham xuc va tinh lai ((dua tren) or (cua tre))*.