Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
danh sai » dung sai, danh bat, danh dau
xe danh » le danh, te danh, xe dan
cua tre » cua te, cua triet, dua tren
hieu le » hieu ve, hieu he, hieu ly
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
cuu tre » cau tren, cau treo
le nam » ly nam, he nam, le na

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) or (sach thu)) nang ma hoa. hieu le nam thu xe danh sai ((cua tre) OR (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sach thu)) nang ma hoa. hieu le nam thu xe danh sai ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) or (sach thu)) nang ma hoa. hieu le nam thu xe danh sai ((cua tre) OR (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (sach thu)) nang ma hoa. hieu le nam thu xe danh sai ((cua tre) OR (cuu tre))*.