Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
sach thi » sach thu, sach tai, sach thieu
su triet » su viet, su tien, ve triet
hanh vai » hanh vi, hanh va, hanh tai
tu tieng » luc tieng, tu tuong, tu trong
thi hanh » thi thanh
hieu va » lieu va, hieu qua
cac tac » cac toc, cac bac, cac dac
cac toi » cac thoi
xa hanh » xa thanh, xa khanh, va hanh
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 tac) or (cac toi)) xa hanh vai ((su triet) or (tu tieng))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach thi hanh ca hoi. hieu va ((cac tac) OR (cac toi)) xa hanh vai ((su triet) OR (tu tieng)).
• Adding a wildcard symbol may retrieve word variants: hoc sach thi hanh ca hoi. hieu va ((cac tac) or (cac toi)) xa hanh vai ((su triet) or (tu tieng))*.