Perhaps you should try some spelling variations:
doc sach » hoc sach, toc sach, nuoc sach
su triet » su viet, su tien
ve triet » va trien
sach ly » sach y, sach lo, sach ty
ly hang » ly quang
hieu ve » hieu va, hieu van
ve chat » va chat, van chat
xuc van » luc van, vuc van, xuc ban
duc van » duc va, duc tan, duc manh
va hoi » xa hoi, va hoc, va hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc sach ly hang va hoi. hieu ve chat ((xuc van) or (duc van)) hanh vi ((su triet) or (ve triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc sach ly hang va hoi. hieu ve chat ((xuc van) OR (duc van)) hanh vi ((su triet) OR (ve triet)).
• Adding a wildcard symbol may retrieve word variants: doc sach ly hang va hoi. hieu ve chat ((xuc van) or (duc van)) hanh vi ((su triet) or (ve triet))*.