Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh va, hanh tai
cac thoi » cac toi, cac hop, cac tro
sach thi » sach thu, sach thieu, sach tham
ve triet » va trien, su triet
sach tai » sach bai, sach tham, sach dao
hanh ca » hanh cac, hanh cat, hanh cua
hieu va » lieu va, hieu qua
xa hanh » xa thanh, xa khanh, va hanh
ca hoi » cau hoi, cua hoi, xa hoi
vai ve » va ve, dai ve, vai va
cac tu » cac thu, cach tu, cac du

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 thi) OR (sach tai)) hanh ca hoi. hieu va ((cac tu) or (cac thoi)) xa hanh vai ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((sach thi) OR (sach tai)) hanh ca hoi. hieu va ((cac tu) OR (cac thoi)) xa hanh vai ve triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc ((sach thi) OR (sach tai)) hanh ca hoi. hieu va ((cac tu) or (cac thoi)) xa hanh vai ve triet".
• Adding a wildcard symbol may retrieve word variants: toc ((sach thi) OR (sach tai)) hanh ca hoi. hieu va ((cac tu) or (cac thoi)) xa hanh vai ve triet*.