Perhaps you should try some spelling variations:
thanh toan » thanh hoa, thanh san, tinh toan
ban thanh » ban hanh, ban hang
nang tai » hang tai, tang tai, sang tai
tai khoa » da khoa, noi khoa
hieu van » hieu va, thien van, lieu va
vu sach » vu bach, su sach, vu khach
qua ban » cua ban, qua quan
cua tre » cuu tre, cua triet, dua tren
cam qua » cau qua, cac qua, cay qua
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va
cua te » cua tu

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

• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky nang tai khoa. ((hieu ve) OR (hieu van)) cam qua ban thanh toan ((cua tre) OR (cua te))~.
• Adding a wildcard symbol may retrieve word variants: vu sach ky nang tai khoa. ((hieu ve) or (hieu van)) cam qua ban thanh toan ((cua tre) or (cua te))*.