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