Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thuc day » thuc dan, thuc vat
day danh » day manh, dai danh, dao danh
danh vai » danh sai, danh va, doanh van
tu sach » thu sach, su sach, te sach
ky lang » ky nang, ky tang, tay lang
ky dang » ky nang, ky danh
hoa doi » hoa dai, hoc doi, xoa doi
vai cua » dai cua, hai cua, lai cua
va nam » ha nam, va nay

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ((ky lang) or (ky dang)) hoa doi. hieu ((va nam) OR (van nam)) thuc day danh vai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ky lang) OR (ky dang)) hoa doi. hieu ((va nam) OR (van nam)) thuc day danh vai cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ky lang) or (ky dang)) hoa doi. hieu ((va nam) OR (van nam)) thuc day danh vai cua triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ky lang) or (ky dang)) hoa doi. hieu ((va nam) OR (van nam)) thuc day danh vai cua triet*.