Perhaps you should try some spelling variations:
sach hoi » sach doi, sach moi, cach thoi
hoi dong » hop dong, hoat dong, ha dong
so sach » so sanh, bo sach, co sach
hai cua » thai cua, dai cua, hoi cua
bai cua » ban cua, dai cua, bai ca
va danh » va dinh, va dan, va hanh
hieu ve » hieu va, hieu van
tay hoi » tay ho, tay thai
tao hoi » tao khoi, tao boi, thao hoc
ve cam » ve cham, ve cac, va cam
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: so sach hoi dong ((tay hoi) OR (tao hoi)). hieu ve cam xuc va danh ((bai cua) or (hai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach hoi dong ((tay hoi) OR (tao hoi)). hieu ve cam xuc va danh ((bai cua) OR (hai cua)) tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach hoi dong ((tay hoi) OR (tao hoi)). hieu ve cam xuc va danh ((bai cua) or (hai cua)) tre*".