Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
ban hang » ngan hang
cau tren » cu tren, dau tren, ca tren
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
xuc ban » duc ban, cuc ban, quoc ban
hang vi » hang va, hanh vi, hang di
cuu tre » cua tre, cau treo
ve cam » ve cham, ve cac, va cam
x hoi » xa hoi, o hoi, x ho

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