Perhaps you should try some spelling variations:
cuu thuc » cuu tac
nang mai » nang ma, nang tai, lang mai
va trinh » van trinh, va tinh, lap trinh
thuc va » thuc vat, thuc dan, thuc day
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
hieu ve » hieu van
mai hoi » mai khoi, dai hoi, lai hoi
y nang » ky nang, ly nang, v nang
su van » tu van, vu van
su va » tu va

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 y nang mai hoi. ((hieu ve) OR (hieu va)) cuu thuc va trinh ((su va) OR (su van)) triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang mai hoi. ((hieu ve) or (hieu va)) cuu thuc va trinh ((su va) OR (su van)) triet~".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang mai hoi. ((hieu ve) or (hieu va)) cuu thuc va trinh ((su va) OR (su van)) triet*.