Perhaps you should try some spelling variations:
sach nay » sach hay, sach vay, sach nang
nay dong » nam dong, day dong, tay dong
dong hoa » dong hoc, dong co
hieu van » hieu va, thien van, lieu va
cau phuc » chau phu, huu phuc, van phuc
tu sach » thu sach, su sach, te sach
hoa doi » hoa dai, hoc doi, xoa doi
va hanh » van hanh, va thanh, va danh
vi cua » vai cua, di cua
cua su » qua su

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 dong hoa doi. hieu van ((cau phuc) OR (cau truc)) va hanh vi cua su~.
• Adding a wildcard symbol may retrieve word variants: tu sach nay dong hoa doi. hieu van ((cau phuc) or (cau truc)) va hanh vi cua su*.