Perhaps you should try some spelling variations:
dinh dai » dinh dat, sinh dai, dinh dao
hieu he » hieu ve, hiem he, hieu le
cua tre » cua te, cua triet, dua tren
thu gia » thue gia, phu gia, thue giao
tu sach » thu sach, te sach, tu cach
sang ma » tang ma, nang ma, sang tao
ky sang » ky nang, ky dang, ky tang
su sach » so sach, vu sach
cuu tre » cau tren, cau treo
ma hoi » mai hoi, xa hoi, ma hoa
he nam » ha nam, nghe nam

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (su sach)) ky sang ma hoi. hieu he nam thu gia dinh dai ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ky sang ma hoi. hieu he nam thu gia dinh dai ((cua tre) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) ky sang ma hoi. hieu he nam thu gia dinh dai ((cua tre) or (cuu tre))*.