Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, tu cach
te sach » toc sach
nang ma » tang ma, sang ma, nang cao
hieu he » hieu ve, hiem he, hieu le
thu nam » tu nam, thu nhap, thu nhat
nam dan » nam dinh
dan sai » danh sai, doan sai, dan tai
sai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
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 (te sach)) y nang ma hoi. hieu he nam thu nam dan sai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (te sach)) y nang ma hoi. hieu he nam thu nam dan sai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (te sach)) y nang ma hoi. hieu he nam thu nam dan sai cua tre*.