Perhaps you should try some spelling variations:
thanh dau » thanh dat, thanh dam, thanh mau
ve triet » va trien, su triet
hieu van » hieu va, thien van, lieu va
tai ban » tai san, tai ngan, tai benh
tac ban » cac ban, tao ban, tay ban
tu sach » thu sach, te sach, tu cach
ty nang » ky nang, ty xang, ty hang
su sach » so sach, vu sach
van hoc » van hoa
dau ve » dap ve
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) OR (su sach)) ty nang x hoi. hieu van hoc ((tac ban) or (tai ban)) thanh dau ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ty nang x hoi. hieu van hoc ((tac ban) OR (tai ban)) thanh dau ve triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (su sach)) ty nang x hoi. hieu van hoc ((tac ban) or (tai ban)) thanh dau ve triet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (su sach)) ty nang x hoi. hieu van hoc ((tac ban) or (tai ban)) thanh dau ve triet*.