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

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 tai ((dua tren) or (((cua tu) OR (cua su))))~.
• 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 tai ((dua tren) OR (((cua tu) OR (cua su)))).
• 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 tai ((dua tren) or (((cua tu) OR (cua su))))".
• Adding a wildcard symbol may retrieve word variants: su sach y nang xa hoi. hieu ve cao duc manh nhan tai ((dua tren) or (((cua tu) OR (cua su))))*.