Perhaps you should try some spelling variations:
ve triet » va trien
nam thuc » nam thuoc, am thuc, nam thu
su triet » su viet, su tien
hanh vai » hanh vi, hanh va, hanh tai
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
tu sach » thu sach, te sach, tu cach
hieu ve » hieu va, hieu van
ly hang » ly quang
su sach » so sach, vu sach
va hoi » xa hoi, va hoc, va hoa
ve nam » he nam, va nam, le nam

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

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