Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
sach thi » sach thu, sach tai, sach thieu
thi hanh » thi thanh
hieu van » hieu va, thien van, lieu va
hanh lam » thanh lap, hanh kem, hanh va
va triet » va thiet, va trien, ve triet
hanh xa » hanh va, hanh ma, hanh xu
van cam » van nam, van lam, van cau
truc va » thuc va, trung va
lam va » nam va, dam va, lam ha

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach thi hanh xa hoi. hieu van cam ((truc va) OR (thuc vat)) hanh lam va triet~.
• Adding a wildcard symbol may retrieve word variants: thu sach thi hanh xa hoi. hieu van cam ((truc va) or (thuc vat)) hanh lam va triet*.