Perhaps you should try some spelling variations:
danh nhan » doanh nhan, thanh nhan, benh nhan
manh nhan » anh nhan, minh nhan, hanh nhan
dua tren » dung tren
su sach » so sach, vu sach
cao duc » dao duc, cao suc, giao duc
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
y nang » ky nang, ly nang, v nang
ve cao » va cao, ve bao, ve cac
cua tu » cua tuc, cua su, cua cu

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 y nang xa hoi. hieu ve cao duc ((manh nhan) OR (danh nhan)) tai ((dua tren) or (cua tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang xa hoi. hieu ve cao duc ((manh nhan) OR (danh nhan)) tai ((dua tren) OR (cua tu)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y nang xa hoi. hieu ve cao duc ((manh nhan) OR (danh nhan)) tai ((dua tren) or (cua tu))".
• Adding a wildcard symbol may retrieve word variants: su sach y nang xa hoi. hieu ve cao duc ((manh nhan) OR (danh nhan)) tai ((dua tren) or (cua tu))*.