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