Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
ban thanh » ban hanh, ban hang
thu sach » tu sach, thuat sach, thuoc sach
tai cua » thai cua, tai cuc, tri cua
cham lo » cham o, cham soc, cham hoi
sach ky » sac ky, sach y, sach ty
hieu vu » hieu va, hieu ve, hieu su
sang ma » tang ma, sang tao, mang may
nang ma » tang ma, nang cao, mang may
cua tre » cua te, cuu tre, cua triet
cam lo » nam lo, cam ly, cam o

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ky ((nang ma) OR (sang ma)) hoi. hieu vu ((cham lo) or (cam lo)) ban thanh tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky ((nang ma) OR (sang ma)) hoi. hieu vu ((cham lo) OR (cam lo)) ban thanh tai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky ((nang ma) OR (sang ma)) hoi. hieu vu ((cham lo) or (cam lo)) ban thanh tai cua tre*".