Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
van hanh » van thanh, ban hanh, van anh
va triet » va thiet, va trien, ve triet
vu nang » vuc nang, va nang, vu dang
xuc van » duc van, luc van, vuc van
hanh de » hanh ve, hanh kem
hieu va » hieu qua
v nang » va nang, van nang, voi nang
de va » de van, te va, ke va

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

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