Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
thu hang » thi hang, thuc hanh, thu huong
hieu van » hieu va, thien van, lieu va
tham duc » pham duc, tham du, thach duc
than duc » tran duc, phan duc, than doc
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
hang x » nang x, hoang xa, chang xu
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 hang x hoi. hieu van ((tham duc) OR (than duc)) ban hanh lai su triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach thu hang x hoi. hieu van ((tham duc) OR (than duc)) ban hanh lai su triet".
• Adding a wildcard symbol may retrieve word variants: su sach thu hang x hoi. hieu van ((tham duc) OR (than duc)) ban hanh lai su triet*.