Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
thu nang » thi nang, thu hang, thu bang
hieu van » hieu va, thien van, lieu va
tham duc » tham du, than duc, thach duc
ban hanh » ban hang
hanh lai » hanh lam, hanh tai, thanh lap
su triet » su viet, su tien, ve triet
su sach » so sach, vu sach
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach thu nang x hoi. hieu van ((tham duc) or (pham duc)) ban hanh lai su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach thu nang x hoi. hieu van ((tham duc) OR (pham duc)) ban hanh lai su triet.
• Adding a wildcard symbol may retrieve word variants: su sach thu nang x hoi. hieu van ((tham duc) or (pham duc)) ban hanh lai su triet*.