Perhaps you should try some spelling variations:
thanh toan » thanh hoa, thanh san, tinh toan
ban thanh » ban hanh, ban hang
hieu van » hieu va, thien van, lieu va
duc ban » duc tan, duc van, dua ban
cua tre » cuu tre, cua triet, dua tren
van lam » van nam
lam duc » lam duoc, pham duc, nam duoc
sach ky » sac ky, sach ty, sach kem
lang xa » lang ha, dang xay, lang van
cua te » cua tu

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 (sach y)) lang xa hoi. hieu van lam duc ban thanh toan ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ky) OR (sach y)) lang xa hoi. hieu van lam duc ban thanh toan ((cua tre) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) or (sach y)) lang xa hoi. hieu van lam duc ban thanh toan ((cua tre) or (cua te))*.