Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
pham duy » pham duc
thanh va » thanh van, hanh va, thanh ha
su triet » su tien, ve triet
so sach » so sanh, bo sach, co sach
hang ca » hang va, nang cao, hang tai
hieu va » lieu va, hieu qua
va pham » van pham, va phat, va phap
duy ban » uy ban, duy van, duy can
su viet » so viet
y hang » ly hang, ty hang, yu hang
ca hoi » cau hoi, cua hoi, 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 y hang ca hoi. hieu va pham duy ban thanh va ((su triet) or (su viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach y hang ca hoi. hieu va pham duy ban thanh va ((su triet) OR (su viet)).
• Adding a wildcard symbol may retrieve word variants: so sach y hang ca hoi. hieu va pham duy ban thanh va ((su triet) or (su viet))*.