Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hanh vai » hanh vi, hanh va, hanh tai
van hanh » van thanh, ban hanh, van anh
thu sach » tu sach, thuat sach, thuoc sach
dang xay » dang van, van xay
sach ky » sac ky, sach y, sach ty
van bac » van ban, van bao, van hac
toc van » hoc van, toc san, tac van
nang xa » nang x, lang xa, nang ma
vai cua » dai cua, hai cua, lai cua
van cac » van hac, van cau, dan cac

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 ((nang xa) or (dang xay)) hoi. hieu ((van cac) OR (van bac)) toc van hanh vai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky ((nang xa) OR (dang xay)) hoi. hieu ((van cac) OR (van bac)) toc van hanh vai cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky ((nang xa) or (dang xay)) hoi. hieu ((van cac) OR (van bac)) toc van hanh vai cua triet".
• Adding a wildcard symbol may retrieve word variants: thu sach ky ((nang xa) or (dang xay)) hoi. hieu ((van cac) OR (van bac)) toc van hanh vai cua triet*.