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, hanh va
van hanh » van thanh, ban hanh, van anh
hieu van » hieu va, lieu va, hieu ve
tru nang » tra nang, tri nang, truc nano
tu nang » tu nong, tu nano, tu lang
su sach » so sach, vu sach
xu van » tu van, vu van, su van
lam va » nam va, dam va, lam ha

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