Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
hanh lai » hanh lam, hanh tai, thanh lap
sach thi » sach thu, sach tai, sach thieu
su triet » su viet, su tien, ve triet
thi hanh » thi thanh
cac tuc » cac toc, cac tu, cac tac
cac toi » cac thoi
xa hanh » xa thanh, xa khanh, va hanh
hieu va » lieu va, hieu qua
ca hoi » cau hoi, cua hoi, co 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) OR (xa hoi)). hieu va ((cac tuc) or (cac toi)) xa hanh lai su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach thi hanh ((ca hoi) OR (xa hoi)). hieu va ((cac tuc) OR (cac toi)) xa hanh lai su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach thi hanh ((ca hoi) OR (xa hoi)). hieu va ((cac tuc) or (cac toi)) xa hanh lai su triet".
• Adding a wildcard symbol may retrieve word variants: hoc sach thi hanh ((ca hoi) OR (xa hoi)). hieu va ((cac tuc) or (cac toi)) xa hanh lai su triet*.