Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thu sach » tu sach, thuat sach, thuoc sach
sang mai » sang ma, sang tai, lang mai
mai hoi » mai khoi, dai hoi, lai hoi
sach ky » sac ky, sach y, sach ty
ve cham » va cham, ve chat, vu cham
ky sang » ky nang, ky dang, ky tang
va hanh » van hanh, va thanh, va danh
ve cam » ve cac, va cam, ve cai
va dau » va dao

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 ky sang mai hoi. hieu ((ve cam) or (ve cham)) xuc ((va hanh) or (va dau)) dai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky sang mai hoi. hieu ((ve cam) OR (ve cham)) xuc ((va hanh) OR (va dau)) dai cua triet.
• Adding a wildcard symbol may retrieve word variants: thu sach ky sang mai hoi. hieu ((ve cam) or (ve cham)) xuc ((va hanh) or (va dau)) dai cua triet*.