Perhaps you should try some spelling variations:
thanh toan » thanh hoa, thanh san, tinh toan
ban thanh » ban hanh, ban hang
toan cua » than cua, tan cua, doanh cua
tu sach » thu sach, te sach, tu cach
cam duc » cam xuc, cao duc, pham duc
su sach » so sach, vu sach
cao hoc » co hoc, cho hoc, chat hoc
hieu ve » hieu van
hieu va » lieu va, hieu qua
duc ban » duc tan, duc van, dua ban
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: ((tu sach) or (su sach)) ky nang cao hoc. ((hieu ve) OR (hieu va)) cam duc ban thanh toan cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ky nang cao hoc. ((hieu ve) OR (hieu va)) cam duc ban thanh toan cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (su sach)) ky nang cao hoc. ((hieu ve) OR (hieu va)) cam duc ban thanh toan cua te".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) ky nang cao hoc. ((hieu ve) OR (hieu va)) cam duc ban thanh toan cua te*.