Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
xuc tuan » duc thuan, quoc tuan, xuan tuan
hieu va » lieu va, hieu qua
anh vai » anh va, anh bai, anh tai
anh van » anh va, thanh van, doanh van
cua tre » cua te, cuu tre, cua triet
sach 7 » sach y, sach 2
7 tang » 6 tang
ma hoi » mai hoi, xa hoi, me hoi
va cam » va cham, va cac, va cao

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 7 tang ((ma hoi) OR (ma hoa)). hieu va cam xuc tuan ((anh vai) or (anh van)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach 7 tang ((ma hoi) OR (ma hoa)). hieu va cam xuc tuan ((anh vai) OR (anh van)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach 7 tang ((ma hoi) OR (ma hoa)). hieu va cam xuc tuan ((anh vai) or (anh van)) cua tre".
• Adding a wildcard symbol may retrieve word variants: thu sach 7 tang ((ma hoi) OR (ma hoa)). hieu va cam xuc tuan ((anh vai) or (anh van)) cua tre*.