Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
thu sach » tu sach, thuat sach, thuoc sach
ban hang » ngan hang
thuc ban » thuoc ban, thuc dan, thu ban
cam thuc » am thuc, nam thuc, cam thu
hang vi » hang va, hanh vi, hang di
cua tre » cua te, cuu tre, cua triet
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa
va cam » va cham, va cac, va cao
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((toc sach) or (thu sach)) ky ((nang xa) or (nang ma)) hoi. lieu va cam thuc ban hang vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (thu sach)) ky ((nang xa) OR (nang ma)) hoi. lieu va cam thuc ban hang vi cua tre.
• Adding a wildcard symbol may retrieve word variants: ((toc sach) or (thu sach)) ky ((nang xa) or (nang ma)) hoi. lieu va cam thuc ban hang vi cua tre*.