Perhaps you should try some spelling variations:
trinh di » trinh do, trinh dien, trinh dinh
te sach » toc sach
cuu tre » cau tren, cau treo
cua tre » cua te, cua triet, dua tren
va luat » va thuat, vay luan, cua luat
hieu va » lieu va, hieu qua
nang ma » tang ma, sang ma, nang cao
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, ma hoa
tuc va » thuc va, truc va, duc 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: te sach y nang ma hoi. hieu va luat ((tuc va) OR (tuc xa)) trinh di ((cuu tre) OR (cua tre))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y nang ma hoi. hieu va luat ((tuc va) OR (tuc xa)) trinh di ((cuu tre) or (cua tre))~".
• Adding a wildcard symbol may retrieve word variants: te sach y nang ma hoi. hieu va luat ((tuc va) OR (tuc xa)) trinh di ((cuu tre) or (cua tre))*.