Perhaps you should try some spelling variations:
gianh lai » gian lan
danh lai » danh sai, dinh lam, hanh lam
tu sach » thu sach, su sach, te sach
thu nam » tu nam, thu nhap, thu nhat
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach ty
hiem he » hiem xe, hieu he, thien he
nang ma » tang ma, sang ma, mang may
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 ky ((nang ma) or (nang cao)) hoi. hiem he nam thu nam ((danh lai) OR (gianh lai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((nang ma) OR (nang cao)) hoi. hiem he nam thu nam ((danh lai) OR (gianh lai)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky ((nang ma) or (nang cao)) hoi. hiem he nam thu nam ((danh lai) OR (gianh lai)) cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((nang ma) or (nang cao)) hoi. hiem he nam thu nam ((danh lai) OR (gianh lai)) cua tre*.