Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
tai hanh » tai thanh, tai nhanh, thi hanh
toc sach » doc sach, thuoc sach, nuoc sach
hoc sach » hoc sinh, hoc cac, hoc anh
hanh ca » hanh cac, hanh cat, hanh cua
cac tuc » cac toc, cac tu, cac tac
cac toi » cac thoi
xa hanh » xa thanh, xa khanh, va hanh
hanh va » hang va, hanh vi
hieu va » lieu va, hieu qua
ca hoi » cau hoi, cua hoi, xa hoi
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: ((toc sach) or (hoc sach)) tai hanh ca hoi. hieu va ((cac tuc) or (cac toi)) xa hanh va cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (hoc sach)) tai hanh ca hoi. hieu va ((cac tuc) OR (cac toi)) xa hanh va cua triet.
• Adding a wildcard symbol may retrieve word variants: ((toc sach) or (hoc sach)) tai hanh ca hoi. hieu va ((cac tuc) or (cac toi)) xa hanh va cua triet*.