Perhaps you should try some spelling variations:
van triet » va triet, van thiet, van trieu
ban thanh » ban hang
hieu van » hieu va, thien van, lieu va
ban hanh » ban hang
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
van dau » van dao, phan dau
dau xuc » dau xac, dau xua, dau nuoc
hai van » thai van, ha van, hai tan
x hoi » xa hoi, o hoi, 5 hoi

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 nang ((x hoi) or (x ho)). hieu van dau xuc ((ban thanh) OR (ban hanh)) hai van triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ((x hoi) OR (x ho)). hieu van dau xuc ((ban thanh) OR (ban hanh)) hai van triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang ((x hoi) or (x ho)). hieu van dau xuc ((ban thanh) OR (ban hanh)) hai van triet*".