Perhaps you should try some spelling variations:
cua triet » su triet, va triet
hanh lai » hanh lam, hanh tai, thanh lap
cua viet » ca viet, hoa viet, cua vat
tu sach » thu sach, su sach, tu cach
te sach » toc sach
cao hoc » co hoc, cho hoc, chat hoc
cam tuc » cam xuc, cam tu, nam thuc
va hanh » van hanh, va thanh, va danh
y nang » ky nang, ly nang, v nang
va cam » va cham, va cac, va cao
tuc va » thuc va, truc va, tuc xa

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) y nang cao hoc. lieu va cam tuc va hanh lai ((cua triet) OR (cua viet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (te sach)) y nang cao hoc. lieu va cam tuc va hanh lai ((cua triet) OR (cua viet))~".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (te sach)) y nang cao hoc. lieu va cam tuc va hanh lai ((cua triet) OR (cua viet))*.