Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
thi hanh » thi thanh
cua viet » ca viet, hoa viet, cua dieu
sach thi » sach thu, sach tai, sach thieu
hanh vai » hanh vi, hanh va, hanh tai
xa hanh » xa thanh, xa khanh, va hanh
hanh ca » hanh cac, hanh cat, hanh cua
hieu va » lieu va, hieu qua
cac tuc » cac toc, cac tu, cac tac
cac toi » cac thoi
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 ((cua viet) OR (cua vat))~.
• 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 ((cua viet) OR (cua vat)).
• 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 ((cua viet) OR (cua vat))".
• Adding a wildcard symbol may retrieve word variants: hoc sach thi hanh ca hoi. hieu va ((cac tuc) or (cac toi)) xa hanh vai ((cua viet) OR (cua vat))*.