Perhaps you should try some spelling variations:
van trinh » van thinh, van tinh, dan trinh
va trinh » va tinh, lap trinh, qua trinh
te sach » toc sach
cao duc » dao duc, cao suc, giao duc
hieu va » lieu va, hieu qua
huu tre » huu tri, cuu tre, huu them
y nang » ky nang, ly nang, may nang
va cao » va cac, va co, va dao
ma hoi » mai hoi, xa hoi, ma hoa
v nang » va nang, vu nang, van nang
di huu » dai huu, do huu, dinh huu

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: te sach ((y nang) OR (v nang)) ma hoi. hieu va cao duc ((va trinh) OR (van trinh)) di huu tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((y nang) or (v nang)) ma hoi. hieu va cao duc ((va trinh) OR (van trinh)) di huu tre~".
• Adding a wildcard symbol may retrieve word variants: te sach ((y nang) or (v nang)) ma hoi. hieu va cao duc ((va trinh) OR (van trinh)) di huu tre*.