Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh lai » thanh hai, thanh lap, thanh loi
te sach » toc sach
sach ky » sac ky, sach y, sach ty
cua tre » cua te, cua triet, dua tren
duc ban » duc tan, duc van, dua ban
cam duc » cam xuc, cao duc, pham duc
cuu tre » cau tren, cau treo
hieu va » lieu va, hieu qua
hieu ve » hieu van
sang ma » tang ma, nang ma, sang tao
ky sang » ky nang, ky dang, ky tang
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky sang ma hoi. ((hieu ve) or (hieu va)) cam duc ban thanh lai ((cua tre) OR (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky sang ma hoi. ((hieu ve) OR (hieu va)) cam duc ban thanh lai ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky sang ma hoi. ((hieu ve) or (hieu va)) cam duc ban thanh lai ((cua tre) OR (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: te sach ky sang ma hoi. ((hieu ve) or (hieu va)) cam duc ban thanh lai ((cua tre) OR (cuu tre))*.