Perhaps you should try some spelling variations:
thanh toan » thanh hoa, thanh san, tinh toan
toan cua » than cua, tan cua, doanh cua
va thanh » gia thanh, ban thanh, va tinh
cua tre » cua te, cuu tre, cua triet
lam duc » lam duoc, pham duc, nam duoc
hieu va » hieu qua
lang xa » lang ha, dang xay, lang van
dang ha » dong ha, dung ha, lang ha
sac ky » cac ky, sai ky
su sac » su sach, su cac, su xac

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sac ky ((lang xa) or (dang ha)) hoi. ((hieu va) OR (lieu va)) lam duc va thanh toan cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky ((lang xa) OR (dang ha)) hoi. ((hieu va) OR (lieu va)) lam duc va thanh toan cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sac ky ((lang xa) or (dang ha)) hoi. ((hieu va) OR (lieu va)) lam duc va thanh toan cua tre".
• Adding a wildcard symbol may retrieve word variants: su sac ky ((lang xa) or (dang ha)) hoi. ((hieu va) OR (lieu va)) lam duc va thanh toan cua tre*.