Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
manh hai » lanh hai, minh hai, thanh hai
sach nay » sach hay, sach vay, sach nang
hai cua » thai cua, dai cua, hoi cua
va manh » van manh, va danh, va hanh
tu sach » thu sach, su sach, te sach
quan ha » quan he
quan xa » quan va, quan cua, quan tai
ve cai » va cai, ve cac, ve tai
va cam » va cham, va cac, va cao
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: tu sach nay ((quan xa) OR (quan ha)) hoi. hieu ((ve cai) OR (va cam)) xuc va manh hai cua viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach nay ((quan xa) OR (quan ha)) hoi. hieu ((ve cai) or (va cam)) xuc va manh hai cua viet~".
• Adding a wildcard symbol may retrieve word variants: tu sach nay ((quan xa) OR (quan ha)) hoi. hieu ((ve cai) or (va cam)) xuc va manh hai cua viet*.