Perhaps you should try some spelling variations:
thanh toan » thanh hoa, thanh san, tinh toan
ban thanh » ban hanh, ban hang
cau treo » cau theo, cau tren, cau triet
cua tre » cua te, cuu tre, cua triet
qua ban » cua ban, qua quan
bo sach » co sach, hoc sach
sach ty » sach y, sach tu, sach thu
van cay » van cau, van ca, van chat
nang ma » tang ma, sang ma, nang cao
ty nang » ky nang, ty xang, ty hang
van bay » van ban, van bao, van bac
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: bo sach ty nang ma hoi. hieu ((van cay) OR (van bay)) qua ban thanh toan ((cua tre) or (cau treo))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: bo sach ty nang ma hoi. hieu ((van cay) OR (van bay)) qua ban thanh toan ((cua tre) OR (cau treo)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "bo sach ty nang ma hoi. hieu ((van cay) OR (van bay)) qua ban thanh toan ((cua tre) or (cau treo))".
• Adding a wildcard symbol may retrieve word variants: bo sach ty nang ma hoi. hieu ((van cay) OR (van bay)) qua ban thanh toan ((cua tre) or (cau treo))*.