Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thu sach » tu sach, thuat sach, thuoc sach
dang xay » dang van, van xay
thai tuc » thai thuc, thai thuy, thu tuc
thai hoc » dai hoc, bai hoc, hoi hoc
sach ky » sac ky, sach y, sach ty
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: thu sach ky ((nang x) or (dang xay)) hoi. hieu qua ((thai tuc) OR (thai hoc)) va hanh va cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky ((nang x) OR (dang xay)) hoi. hieu qua ((thai tuc) OR (thai hoc)) va hanh va cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky ((nang x) or (dang xay)) hoi. hieu qua ((thai tuc) OR (thai hoc)) va hanh va cua triet".
• Adding a wildcard symbol may retrieve word variants: thu sach ky ((nang x) or (dang xay)) hoi. hieu qua ((thai tuc) OR (thai hoc)) va hanh va cua triet*.