Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
cua tren » dua tren, ca tren, cua tre
thanh da » thanh dat, thanh dam, thanh dan
vu khach » vu khanh, vu khac, vay khach
hieu ve » hieu va, hieu van
cao duc » dao duc, cao suc, giao duc
duc ban » duc tan, duc van, dua ban
su sach » so sach, vu sach
ve cao » va cao, ve bao, ve cac
da cua » dai cua, day cua, dan cua
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 cao duc ban thanh da cua 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 cao duc ban thanh da cua tren.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vu khach)) ky nang ((x hoi) or (xa hoi)). hieu ve cao duc ban thanh da cua tren*.