Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh di » thanh doi, thanh de, thanh do
dau tren » dau tien, dat tren, dau tieng
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
cao suc » cao su, cao duc
suc ban » suc ben, duc ban, cuc ban
ve cao » va cao, ve bao, ve cac
di dau » doi dau, bi dau, di du
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 (vay khach)) ky nang ((x hoi) or (xa hoi)). hieu ve cao suc ban thanh di dau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vay khach)) ky nang ((x hoi) OR (xa hoi)). hieu ve cao suc ban thanh di dau tren.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vay khach)) ky nang ((x hoi) or (xa hoi)). hieu ve cao suc ban thanh di dau tren*.