Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
sach thi » sach thu, sach tai, sach thieu
thi hanh » thi thanh
su triet » su viet, ve triet
hanh vai » hanh vi, hanh va, hanh tai
xa hanh » xa thanh, xa khanh, va hanh
cac toi » cac thoi
su tien » su kien, su hien, tu tieng
cac tuc » cac toc, cac tu, cac tac
hieu va » lieu va, hieu qua
hanh ca » hanh cac, hanh cat, hanh cua
ca hoi » cau hoi, cua hoi, xa hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sach thi hanh ca hoi. hieu va ((cac tuc) or (cac toi)) xa hanh vai ((su triet) OR (su tien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach thi hanh ca hoi. hieu va ((cac tuc) OR (cac toi)) xa hanh vai ((su triet) OR (su tien)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach thi hanh ca hoi. hieu va ((cac tuc) or (cac toi)) xa hanh vai ((su triet) OR (su tien))".
• Adding a wildcard symbol may retrieve word variants: hoc sach thi hanh ca hoi. hieu va ((cac tuc) or (cac toi)) xa hanh vai ((su triet) OR (su tien))*.