Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
ban hanh » ban hang
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
cam duc » cam xuc, cao duc, pham duc
duc ban » duc tan, duc van, dua ban
vi cau » va cau, di cau, viet cau
ve cau » ke cau, va cau, ve cac
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 duc ban hanh ((vi cau) or (ve 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 duc ban hanh ((vi cau) OR (ve cau)) tren.
• Adding a wildcard symbol may retrieve word variants: ((toc sach) or (su sach)) ky nang x hoi. hieu ve cam duc ban hanh ((vi cau) or (ve cau)) tren*.