Perhaps you should try some spelling variations:
thien van » thi van
va triet » va thiet, va trien, ve triet
hanh lam » thanh lap, hanh kem, dinh lam
hieu van » hieu va, lieu va, hieu ve
sach tu » sach thu, cach tu, sach ty
nang xa » nang x, lang xa, nang ma
tu nang » tru nang, tu nong, tu nano
hanh va » hang va, hanh vi
su sach » so sach, vu sach
xu van » tu van, vu van, su van

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 van) or (thien van)) chao xu van ((hanh lam) OR (hanh va)) va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach tu nang xa hoi. ((hieu van) OR (thien van)) chao xu van ((hanh lam) OR (hanh va)) va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach tu nang xa hoi. ((hieu van) or (thien van)) chao xu van ((hanh lam) OR (hanh va)) va triet".
• Adding a wildcard symbol may retrieve word variants: su sach tu nang xa hoi. ((hieu van) or (thien van)) chao xu van ((hanh lam) OR (hanh va)) va triet*.