Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
ban hang » ngan hang
van cam » van nam, van lam, van dam
hang vi » hang va, hanh vi, hang di
xuc ban » duc ban, cuc ban, quoc ban
van cau » van dau, van hau, van chat
lang ha » long ha
ky lang » ky nang, ky dang, ky tang
cuu tre » cua tre, cau tren, cau treo
ha hoi » hoa hoi, ha noi, xa hoi
vi cuu » vi luu, vinh cuu

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 lang ha hoi. hieu ((van cam) OR (van cau)) xuc ban hang vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ky lang ha hoi. hieu ((van cam) OR (van cau)) xuc ban hang vi cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (toc sach)) ky lang ha hoi. hieu ((van cam) OR (van cau)) xuc ban hang vi cuu tre".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (toc sach)) ky lang ha hoi. hieu ((van cam) OR (van cau)) xuc ban hang vi cuu tre*.