Perhaps you should try some spelling variations:
manh nhan » danh nhan, anh nhan, minh nhan
dua tren » dung tren
nhan tai » hang tai, van tai, toan tai
duc manh » suc manh, duc anh, duc minh
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
cao duc » dao duc, cao suc, giao duc
ve cao » va cao, ve bao, ve cac
y nang » ky nang, ly nang, may nang
v nang » va nang, vu nang, van nang
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) OR (v nang)) xa hoi. hieu ve cao duc manh nhan tai ((dua tren) or (cua tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((y nang) OR (v nang)) xa hoi. hieu ve cao duc manh nhan tai ((dua tren) OR (cua tu)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((y nang) OR (v nang)) xa hoi. hieu ve cao duc manh nhan tai ((dua tren) or (cua tu))".
• Adding a wildcard symbol may retrieve word variants: su sach ((y nang) OR (v nang)) xa hoi. hieu ve cao duc manh nhan tai ((dua tren) or (cua tu))*.