Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
ban hanh » ban hang
chat xuc » chat huu, cam xuc, chao xu
hoi hoi » hoi hoc, hoc hoi, hoi doi
hieu ve » hieu va, hieu van
sach ky » sac ky, sach y, sach ty
xuc ban » duc ban, cuc ban, quoc ban
ky tang » ky nang, ky dang, kho tang
vien va » dien va, vien da, viec va
tien va » dien va, thien van
ve chat » va chat, van chat
ho hoi » hoc hoi, hoa hoi, co hoi

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ky tang ((ho hoi) OR (hoi hoi)). hieu ve chat xuc ban hanh ((vien va) or (tien va)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky tang ((ho hoi) OR (hoi hoi)). hieu ve chat xuc ban hanh ((vien va) OR (tien va)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky tang ((ho hoi) OR (hoi hoi)). hieu ve chat xuc ban hanh ((vien va) or (tien va)) triet".
• Adding a wildcard symbol may retrieve word variants: thu sach ky tang ((ho hoi) OR (hoi hoi)). hieu ve chat xuc ban hanh ((vien va) or (tien va)) triet*.