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