Perhaps you should try some spelling variations:
thu nang » thi nang, thu hang, thu bang
hieu van » hieu va, thien van, lieu va
sach thu » sach thue, sach thieu, sach tham
tap cua » tap quan, tiep cua
lap cua » lai cua, lam cua, ap cua
su sach » so sach, vu sach
tay ban » tai ban, tay bac, tao ban
day ban » da ban, day dan, day manh
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) OR (tap 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) OR (tap cua)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach thu nang x hoi. hieu van ban ((day ban) or (tay ban)) thanh ((lap cua) OR (tap 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) OR (tap cua)) triet*.