Perhaps you should try some spelling variations:
chat xuc » chat huu, cam xuc, chao xu
van hanh » van thanh, ban hanh, van anh
hieu van » thien van, lieu va, hieu ve
xuc van » duc van, luc van, vuc van
so sach » so sanh, bo sach, co sach
sach ty » sach y, sach tu, sach thu
hieu va » lieu va, hieu qua
ty nang » ky nang, ty xang, ty hang
lam va » dam va, lam ha, am va
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ty nang x hoi. ((hieu van) or (hieu va)) chat xuc van hanh ((lam va) OR (nam va)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ty nang x hoi. ((hieu van) OR (hieu va)) chat xuc van hanh ((lam va) OR (nam va)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ty nang x hoi. ((hieu van) or (hieu va)) chat xuc van hanh ((lam va) OR (nam va)) triet".
• Adding a wildcard symbol may retrieve word variants: so sach ty nang x hoi. ((hieu van) or (hieu va)) chat xuc van hanh ((lam va) OR (nam va)) triet*.