Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
nam thuoc » nam thuc, nam thu, nha thuoc
hieu van » hieu va, thien van, lieu va
thuoc va » thuc va, thuoc ma, thuong va
tu sach » thu sach, te sach, tu cach
su sach » so sach, vu sach
ky tang » ky nang, ky dang, kho tang
tang xa » trang xa, tang ma, lang xa
va hanh » van hanh, va thanh, va danh
hanh va » hang va, hanh vi
va cua » va chua, via cua, ca cua

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) OR (su sach)) ky tang xa hoi. hieu van nam thuoc va hanh va cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (su sach)) ky tang xa hoi. hieu van nam thuoc va hanh va cua triet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (su sach)) ky tang xa hoi. hieu van nam thuoc va hanh va cua triet*.