Perhaps you should try some spelling variations:
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
hanh va » hang va, hanh vi
ca hoi » cau hoi, cua hoi, xa hoi
cac tu » cac thu, cach tu, cac du
va ve » va de, va le, va vi

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 va 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 va 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 va ve triet*.