Perhaps you should try some spelling variations:
vi triet » ve triet, va triet, tim triet
tan hanh » tan thanh, tang hanh, toan hanh
hieu van » hieu va, thien van, lieu va
nang xa » nang x, lang xa, nang ma
su sach » so sach, vu sach
cao duc » cao suc, giao duc, tao duoc
dao duc » giao duc, tao duoc
tu sach » thu sach, te sach, tu cach
2 nang » v nang
vi vi » va vi, vi ve

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) OR (su sach)) 2 nang xa hoi. hieu van ((cao duc) or (dao duc)) tan hanh vi vi triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) 2 nang xa hoi. hieu van ((cao duc) OR (dao duc)) tan hanh vi vi triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (su sach)) 2 nang xa hoi. hieu van ((cao duc) or (dao duc)) tan hanh vi vi triet*".