Perhaps you should try some spelling variations:
thanh toan » thanh hoa, thanh san, tinh toan
hieu van » hieu va, thien van, lieu va
toan cua » than cua, tan cua, doanh cua
van lam » van nam
cua tre » cua te, cuu tre, cua triet
dang xa » dang xay, lang xa, dang ha
dong ha » dong hoa, dong va, dong hoc
sai ky » sac ky
xuc va » tuc va, luc va, xac va
su sai » su tai, su hai, su dai

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sai ky ((dang xa) or (dong ha)) hoi. hieu van lam ((xuc va) or (duc va)) thanh toan cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sai ky ((dang xa) OR (dong ha)) hoi. hieu van lam ((xuc va) OR (duc va)) thanh toan cua tre.
• Adding a wildcard symbol may retrieve word variants: su sai ky ((dang xa) or (dong ha)) hoi. hieu van lam ((xuc va) or (duc va)) thanh toan cua tre*.