Perhaps you should try some spelling variations:
thanh lap » thanh san, phan lap, thanh hai
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
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: tu sach ty nang x hoi. hieu van ban ((day ban) OR (tay ban)) thanh lap cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang x hoi. hieu van ban ((day ban) OR (tay ban)) thanh lap cua triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang x hoi. hieu van ban ((day ban) OR (tay ban)) thanh lap cua triet*.