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

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