Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
van hanh » van thanh, ban hanh, van anh
hanh vai » hanh vi, hanh va, hanh tai
hoa hoi » khoa hoi, hoa hoc, hoc hoi
hoa doi » hoa dai, hoc doi, xoa doi
sach ky » sac ky, sach y, sach ty
thu van » thuc van, thuy van, tu van
ky lang » ky nang, ky dang, ky tang
vai cua » dai cua, hai cua, lai cua
te sach » toc sach
le nam » he nam, le na, te nam

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

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