Perhaps you should try some spelling variations:
thanh lap » thanh san, phan lap, thanh hai
cua triet » cua viet, su triet, va triet
sach thu » sach thue, sach thieu, sach tham
thu nang » thi nang, thu hang, thu bang
hieu van » hieu va, thien van, lieu va
su sach » so sach, vu sach
day ban » da ban, day dan, day manh
tay ban » tai ban, tay bac, tao ban
lap cua » lai cua, tap cua, lam cua
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 ban ((day ban) or (tay ban)) thanh lap cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach thu nang x hoi. hieu van ban ((day ban) OR (tay ban)) thanh lap cua triet.
• Adding a wildcard symbol may retrieve word variants: su sach thu nang x hoi. hieu van ban ((day ban) or (tay ban)) thanh lap cua triet*.