Perhaps you should try some spelling variations:
vu khanh » vu thanh, van khanh, duy khanh
hieu van » hieu va, thien van, lieu va
ban hanh » ban hang
cau tren » cu tren, dau tren, ca tren
vu sach » vu bach, su sach, vu khach
van cao » van dao, van bao, van hao
cao tuc » dao tuc, cao duc, cao suc
tuc ban » thuc ban, truc ban, tu ban
hanh di » hanh vi, hanh de, hang di
di cau » da cau, diem cau

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((vu sach) or (vu khanh)) ky nang ((x ho) or (xa hoi)). hieu van cao tuc ban hanh di cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (vu khanh)) ky nang ((x ho) OR (xa hoi)). hieu van cao tuc ban hanh di cau tren.
• Adding a wildcard symbol may retrieve word variants: ((vu sach) or (vu khanh)) ky nang ((x ho) or (xa hoi)). hieu van cao tuc ban hanh di cau tren*.