Perhaps you should try some spelling variations:
va triet » va trien, ve triet, cua triet
hieu van » hieu va, thien van, lieu va
hanh dao » lanh dao, thanh dat, thanh dam
hanh tai » thanh tai, hang tai, han tai
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
cau xuc » cam xuc, cau luc, cau truc
van cau » van dau, van hau, van chat
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
xuc va » duc va, tuc va, luc va
thiet » thieu

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

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