Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thac toc » cac toc, thac cac, thi toc
hieu va » lieu va, hieu qua
sach ky » sach y, sach ty, sach kem
xa hanh » xa thanh, xa khanh, va hanh
hanh va » hang va, hanh vi
hac tuc » thai tuc
sac ky » cac ky, sai ky
va cua » va chua, via cua, ca cua
x hoi » xa hoi, o hoi, x ho

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: thu ((sach ky) OR (sac ky)) nang x hoi. hieu va ((hac tuc) OR (thac toc)) xa hanh va cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((sach ky) or (sac ky)) nang x hoi. hieu va ((hac tuc) OR (thac toc)) xa hanh va cua triet~".
• Adding a wildcard symbol may retrieve word variants: thu ((sach ky) or (sac ky)) nang x hoi. hieu va ((hac tuc) OR (thac toc)) xa hanh va cua triet*.