Perhaps you should try some spelling variations:
thanh toan » thanh hoa, thanh san, tinh toan
thuoc sach » hoc sach, nuoc sach, thuat sach
hieu van » hieu va, thien van, lieu va
toan cua » than cua, tan cua, doanh cua
may hoi » may thoi, tay hoi, mai hoi
cua tre » cua te, cuu tre, cua triet
sach 6 » sach y, sach 2
cam lo » nam lo, cam ly, cam o
mang » nang, dang, bang

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc sach 6 mang may hoi. hieu van ((cham h'roi) or (cam lo)) gia thanh toan cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach 6 mang may hoi. hieu van ((cham h'roi) OR (cam lo)) gia thanh toan cua tre.
• Adding a wildcard symbol may retrieve word variants: thuoc sach 6 mang may hoi. hieu van ((cham h'roi) or (cam lo)) gia thanh toan cua tre*.