Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh hoa » thanh pho
van triet » va triet, van thiet, van trieu
hieu van » hieu va, thien van, lieu va
dau nuoc » dat nuoc, dau ngoc, cap nuoc
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
dau xuc » dau xac, dau xua
hoa van » hoa dan, hoang van, hoa phan
x hoi » o hoi, x ho, 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: su sach ky nang ((x hoi) or (xa hoi)). hieu van ((dau xuc) OR (dau nuoc)) ban thanh hoa van triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang ((x hoi) OR (xa hoi)). hieu van ((dau xuc) OR (dau nuoc)) ban thanh hoa van triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang ((x hoi) or (xa hoi)). hieu van ((dau xuc) OR (dau nuoc)) ban thanh hoa van triet*".