Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
ban hanh » ban hang
so sach » so sanh, bo sach, co sach
cham tu » pham tu, cam tu, chai tu
va cham » va chat, va tham
hieu va » lieu va, hieu qua
su viet » so viet
tu ban » thu ban, te ban
ha hoi » hoa hoi, ha noi, 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: so sach _ lang ((ha hoi) or (hoa hoc)). hieu va cham tu ban hanh vi ((cua triet) or (su viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach _ lang ((ha hoi) OR (hoa hoc)). hieu va cham tu ban hanh vi ((cua triet) OR (su viet)).
• Adding a wildcard symbol may retrieve word variants: so sach _ lang ((ha hoi) or (hoa hoc)). hieu va cham tu ban hanh vi ((cua triet) or (su viet))*.