Perhaps you should try some spelling variations:
thanh van » thanh san, thanh toan, thanh phan
ban thanh » ban hanh, ban hang
cau treo » cau theo, cau tren, cau triet
hieu van » hieu va, thien van, lieu va
cua tre » cua te, cuu tre, cua triet
qua ban » cua ban, qua quan
cay qua » cau qua, cac qua, cay lua
sach ty » sach y, sach thu, xach tay
nang ma » tang ma, sang ma, nang cao
sach tu » sach thu, cach tu, sach uu
van cay » van cau, van bay, van ca
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: so ((sach ty) OR (sach tu)) nang ma hoi. hieu van cay qua ban thanh van ((cua tre) or (cau treo))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so ((sach ty) OR (sach tu)) nang ma hoi. hieu van cay qua ban thanh van ((cua tre) OR (cau treo)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "so ((sach ty) OR (sach tu)) nang ma hoi. hieu van cay qua ban thanh van ((cua tre) or (cau treo))".
• Adding a wildcard symbol may retrieve word variants: so ((sach ty) OR (sach tu)) nang ma hoi. hieu van cay qua ban thanh van ((cua tre) or (cau treo))*.