Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, va tinh
thanh di » thanh doi, thanh de, thanh do
cau tren » cu tren, dau tren, ca tren
su sach » so sach, vu sach
vu khac » vu kham, vu khanh, bui khac
hieu ve » hieu va, hieu van
cao tuc » dao tuc, cao duc, cao suc
ve cao » va cao, ve bao, ve cac
tuc va » thuc va, truc va, tuc xa
di cau » da cau, diem 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 khac)) ky nang ((x hoi) or (xa hoi)). hieu ve cao tuc va thanh di cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu khac)) ky nang ((x hoi) OR (xa hoi)). hieu ve cao tuc va thanh di cau tren.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vu khac)) ky nang ((x hoi) or (xa hoi)). hieu ve cao tuc va thanh di cau tren*.