Perhaps you should try some spelling variations:
cua nhan » ca nhan, cua ngan, cua nha
hieu cua » hieu qua, dieu cua, bieu cua
danh doi » danh di, thanh doi, dung doi
nhan duc » nhan duoc, nhan luc, phan duc
cua tre » cua te, cua triet, dua tren
va danh » va dinh, va dan, va hanh
su sach » vu sach
tang ma » mang may, tang van
so sach » so sanh, bo sach, co sach
cuu tre » cau tren, cau treo
ma hoi » mai hoi, xa hoi, ma hoa
y tang » ky tang, 6 tang, 7 tang

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: ((su sach) OR (so sach)) y tang ma hoi. hieu cua nhan duc va danh doi ((cua tre) OR (cuu tre))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (so sach)) y tang ma hoi. hieu cua nhan duc va danh doi ((cua tre) or (cuu tre))~".
• Adding a wildcard symbol may retrieve word variants: ((su sach) OR (so sach)) y tang ma hoi. hieu cua nhan duc va danh doi ((cua tre) or (cuu tre))*.