Perhaps you should try some spelling variations:
thanh toan » thanh hoa, thanh san, tinh toan
hoc sach » hoc sinh, hoc cac, hoc anh
toan cua » than cua, tan cua, doanh cua
va thanh » gia thanh, ban thanh, va tinh
cong hoa » dong hoc, hang hoa
dong hoa » dong hoc, dong co
hieu van » hieu va, thien van, lieu va
thuc va » thuc vat, thuc dan, thuc day
sach ky » sac ky, sach y, sach ty
lang xa » lang ha, dang xay, lang van
van am » van nam, van lam, van dam
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: hoc sach ky ((lang xa) or (((cong hoa) or (dong hoa)))) hoi. hieu van am thuc va thanh toan cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ky ((lang xa) OR (((cong hoa) OR (dong hoa)))) hoi. hieu van am thuc va thanh toan cua te.
• Adding a wildcard symbol may retrieve word variants: hoc sach ky ((lang xa) or (((cong hoa) or (dong hoa)))) hoi. hieu van am thuc va thanh toan cua te*.