Perhaps you should try some spelling variations:
hieu van » thien van, lieu va, hieu ve
ban hanh » ban hang
hanh vai » hanh vi, hanh va, hanh tai
va triet » va thiet, va trien, ve triet
tu sach » thu sach, su sach, te sach
ky dang » ky nang
ky danh » ky anh
hieu va » lieu va, hieu qua
cac tac » cac toc, cac bac, cac dac
tac ban » tai ban, cac ban, tao ban
vai va » mai va, dai va, hai va

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 ((ky dang) or (ky danh)) xa hoi. ((hieu van) OR (hieu va)) cac tac ban hanh vai va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ky dang) OR (ky danh)) xa hoi. ((hieu van) OR (hieu va)) cac tac ban hanh vai va triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ky dang) or (ky danh)) xa hoi. ((hieu van) OR (hieu va)) cac tac ban hanh vai va triet*".