Perhaps you should try some spelling variations:
toc sach » doc sach, thuoc sach, nuoc sach
hang ket » hang ke, thong ket, hang viet
ban hang » ngan hang
va trien » va truyen, va thiet, va tuyen
tay lang » tai lang, tay tang, tay quang
hoc sach » hoc sinh, hoc cac, hoc anh
lang xa » lang ha, dang xay, lang van
xuc ban » duc ban, cuc ban, quoc ban
ve cac » va cac, vien cac
ket va » ket van
ve cam » ve cham, va cam, ve cai

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 (hoc sach)) tay lang xa hoi. hieu ((ve cam) or (ve cac)) xuc ban hang ket va trien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (hoc sach)) tay lang xa hoi. hieu ((ve cam) OR (ve cac)) xuc ban hang ket va trien.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) OR (hoc sach)) tay lang xa hoi. hieu ((ve cam) or (ve cac)) xuc ban hang ket va trien".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) OR (hoc sach)) tay lang xa hoi. hieu ((ve cam) or (ve cac)) xuc ban hang ket va trien*.