Perhaps you should try some spelling variations:
thien van » thi van
nang mai » nang ma, nang tai, lang mai
hieu van » hieu va, lieu va, hieu ve
lam duoc » nam duoc, luat duoc, lam thuoc
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
mai hoi » mai khoi, dai hoi, lai hoi
va tinh » may tinh
ca cua » co cua
cua te » cua tu

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: so sach ky nang mai hoi. ((hieu van) OR (thien van)) lam duoc ((va tinh) OR (gia thanh)) ca cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ky nang mai hoi. ((hieu van) OR (thien van)) lam duoc ((va tinh) or (gia thanh)) ca cua te~".
• Adding a wildcard symbol may retrieve word variants: so sach ky nang mai hoi. ((hieu van) OR (thien van)) lam duoc ((va tinh) or (gia thanh)) ca cua te*.