Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
cau tren » cu tren, dau tren, ca tren
thanh va » thanh van, hanh va, thanh ha
vu khach » vu khanh, vu khac, vay khach
hieu ve » hieu va, hieu van
bao duc » dao duc, bao luc, cao duc
duc ban » duc tan, duc van, dua ban
su sach » so sach, vu sach
ve bao » te bao, va bao
va cau » van cau, va cac, va dau
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) or (vu khach)) ky nang ((x hoi) or (xa hoi)). hieu ve bao duc ban thanh va cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu khach)) ky nang ((x hoi) OR (xa hoi)). hieu ve bao duc ban thanh va cau tren.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vu khach)) ky nang ((x hoi) or (xa hoi)). hieu ve bao duc ban thanh va cau tren*.