Perhaps you should try some spelling variations:
thien van » thi van
thanh duc » thach duc, than duc, thinh duc
ve triet » va trien, su triet
su sach » so sach, vu sach
sach tu » sach thu, cach tu, sach ty
tu nang » tru nang, tu nong, tu nano
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
vi ve » va ve, gi ve, ve ve

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 tu nang xa hoi. ((hieu va) or (thien van)) thanh duc va hanh vi ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach tu nang xa hoi. ((hieu va) OR (thien van)) thanh duc va hanh vi ve triet.
• Adding a wildcard symbol may retrieve word variants: su sach tu nang xa hoi. ((hieu va) or (thien van)) thanh duc va hanh vi ve triet*.