Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
hanh dai » hanh tai, hanh dao, vanh dai
van chat » cao chat
sach ky » sach y, sach ty, sach kem
van cau » van dau, van hau, toan cau
va hanh » van hanh, va thanh, va danh
nang o » nang co, nang ho, nang ro
sac ky » cac ky, sai ky
dai su » dai sua, dai so, dan su
o hoi » co hoi, o hoc, o hai

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 ky) OR (sac ky)) nang o hoi. hieu ((van cau) OR (van chat)) duc va hanh dai su triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) OR (sac ky)) nang o hoi. hieu ((van cau) or (van chat)) duc va hanh dai su triet~".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) OR (sac ky)) nang o hoi. hieu ((van cau) or (van chat)) duc va hanh dai su triet*.