Perhaps you should try some spelling variations:
thanh toan » thanh hoa, thanh san, tinh toan
ban thanh » ban hanh, ban hang
nang cho » nang chon, ngang cho, nang cao
cam cac » ca cac, nam cac, cam chan
cuc tre » cua tre, cuu tre, cuc thue
cac ban » cac dan, cac van, can ban
duc tre » duoc tren, duc tien
sach ty » sach tu, sach thu, xach tay
hieu ve » hieu va, hieu van
cho hoc » co hoc, khoa hoc
ve cam » ve cham, ve cac, va cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach ty) or (sach y)) nang cho hoc. hieu ve cam cac ban thanh toan ((cuc tre) OR (duc tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ty) OR (sach y)) nang cho hoc. hieu ve cam cac ban thanh toan ((cuc tre) OR (duc tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ty) or (sach y)) nang cho hoc. hieu ve cam cac ban thanh toan ((cuc tre) OR (duc tre))".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) or (sach y)) nang cho hoc. hieu ve cam cac ban thanh toan ((cuc tre) OR (duc tre))*.