Perhaps you should try some spelling variations:
thanh toan » thanh hoa, thanh san, tinh toan
toan cua » than cua, tan cua, doanh cua
thu sach » thuat sach, thuoc sach, thu hoach
tu sach » su sach, te sach, tu cach
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
nang ma » tang ma, sang ma, nang cao
ve cho » ve co, ve che, de cho
cho xu » chao xu, choi xu, cho xa
xu gia » xu giao, vu gia

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 (thu sach)) ty ((nang ma) or (nang x)) hoi. hieu ve cho xu gia thanh toan cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ty ((nang ma) OR (nang x)) hoi. hieu ve cho xu gia thanh toan cua tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) ty ((nang ma) or (nang x)) hoi. hieu ve cho xu gia thanh toan cua tre*.