Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, tu cach
hai cua » thai cua, dai cua, hoi cua
sai cua » dai cua, lai cua, bai cua
nam dan » nam dinh
thu nam » tu nam, thu nhap, thu nhat
hieu he » hieu ve, hiem he, hieu le
nang ma » tang ma, sang ma, nang cao
te sach » toc sach
he nam » ha nam, nghe nam
ma hoi » mai hoi, xa hoi, ma hoa
y nang » ky nang, ly nang, v nang

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) OR (hai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) y nang ma hoi. hieu he nam thu nam dan ((sai cua) OR (hai 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) OR (hai 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) OR (hai cua)) tre*.