Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
ban thanh » ban hanh, ban hang
hieu van » hieu va, thien van, lieu va
dung mat » duong mat, dung dat, dung may
cuu tre » cau tren, cau treo
dua ban » dia ban, cua ban, qua ban
sach ky » sach y, sach ty, sach kem
mat hoa » ma hoa, mai hoa, chat hoa
cua tre » cua te, cua triet, dua tren
van ca » van cau, van cua, dan ca
ca dua » cay dua, ca cua, ca da
sac ky » cac ky, sai ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: su ((sach ky) OR (sac ky)) dung mat hoa. hieu van ca dua ban thanh vai ((cuu tre) or (cua tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ky) OR (sac ky)) dung mat hoa. hieu van ca dua ban thanh vai ((cuu tre) OR (cua tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ky) OR (sac ky)) dung mat hoa. hieu van ca dua ban thanh vai ((cuu tre) or (cua tre))".
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) OR (sac ky)) dung mat hoa. hieu van ca dua ban thanh vai ((cuu tre) or (cua tre))*.