Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hieu van » hieu va, thien van, lieu va
su triet » su viet, su tien, ve triet
cua viet » ca viet, hoa viet, cua vat
sach ly » sach y, sach lo, sach ty
ly hang » ly quang
van cam » van nam, van lam, van cau
va hanh » van hanh, va thanh, va danh
ca hoi » cau hoi, cua hoi, co hoi
xuc va » duc va, tuc va, luc va

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 ly hang ((ca hoi) or (xa hoi)). hieu van cam xuc va hanh vi ((su triet) or (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ly hang ((ca hoi) OR (xa hoi)). hieu van cam xuc va hanh vi ((su triet) OR (cua viet)).
• Adding a wildcard symbol may retrieve word variants: toc sach ly hang ((ca hoi) or (xa hoi)). hieu van cam xuc va hanh vi ((su triet) or (cua viet))*.