Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
ban hang » ngan hang
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va, hieu van
xuc ban » duc ban, cuc ban, quoc ban
tai cua » thai cua, tai cuc, dai cua
ma hoi » mai hoi, xa hoi, ma hoa
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: ((te sach) or (toc sach)) ky nang ma hoi. hieu ve cam xuc ban hang ((tai cua) OR (tri cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ky nang ma hoi. hieu ve cam xuc ban hang ((tai cua) OR (tri cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (toc sach)) ky nang ma hoi. hieu ve cam xuc ban hang ((tai cua) OR (tri cua)) tre".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (toc sach)) ky nang ma hoi. hieu ve cam xuc ban hang ((tai cua) OR (tri cua)) tre*.