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