Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
hieu van » thien van, lieu va, hieu ve
hanh lam » thanh lap, hanh kem, dinh lam
chat xuc » chat huu, cam xuc, chao xu
hieu va » lieu va, hieu qua
sach ty » sach y, sach tu, sach thu
xuc van » duc van, luc van, vuc van
ty nang » ky nang, ty xang, ty hang
hanh va » hang va, hanh vi
so sach » so sanh, bo sach, co sach
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) OR (hanh va)) 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) OR (hanh va)) 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) OR (hanh va)) 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) OR (hanh va)) va triet*.